Wednesday, 4 November 2026
Wednesday, 4 November 2026
- In brief
- 185 health and environment groups ask the WHO to lower its drinking-water nitrate limit, set in 1958 to prevent blue baby syndrome
- SignalSmall early studies that did not hold up
- 2Births to stop at Daisy Hill on 23 November
- 3Powys may cut its hospital beds
- 4A walk-in mental health centre's first months
- 5A new Belfast maternity hospital stays shut
- 6People slept in cars for free care near Washington
- 7Kenya weighs the HPV vaccine for boys
- 8Israel's health report shows gaps by income
- 9Punjab's free blood-cancer drugs run out
- 10France writes to every 29-year-old about fertility
- 11A first-time marathon runner dies of muscle breakdown
- 12Elections and the heart
- 13Disgust, the body and politics
- 14Ultra-processed food and children's brains
- 15A vibrating mattress and the brain's cleaning system
- 16Socks that stiffen the foot
- 17Where psilocybin is taken may matter
- 18Blueberries and low mood, in 18 people
- 19Reframing a texture calms an autistic brain
- 20Cannabis use follows the menstrual cycle
- 21Why a touch can bring sudden sadness
- 22Sunscreen fears on TikTok
- 23Weight-loss drug advice from strangers online
- 24Bone loss starts before the last period
- 25Feeling shut out and backing violence
4 Nov · Mind & body · In brief
Mind & body · Wednesday, 4 November 2026
Mind & body, in brief
25 stories · 34 sources
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What is moving · 1 of 4
Care moving further from home
Births at Daisy Hill in Newry move to Craigavon from 23 November, about 1,700 of them.
What is moving · 2 of 4
Care people cannot pay for
Near Washington DC, 467 people came to a free clinic, some sleeping in their cars.
What is moving · 3 of 4
Small studies, big headlines
Foot-stiffening socks were tested on 12 adults.
What is moving · 4 of 4
Elections and the mind
Irregular heartbeats rose 77% around the 2016 US vote in people with heart devices.
Part of the day's signal
One pressure seen across the day runs through Mind & body too.
25 stories
11 sources
Mind & body, in brief
- 10No babies to be born at hospital from end of November
- 11Rural health board shake-up opposed as locals fight cuts to hospital beds
- 14A Few Miles From the US Capitol, Dozens Slept in Their Cars, Waiting for Free Care
- 16New health report reveals deep socioeconomic disparities in Israeli care
- 17Punjab govt's Chronic Myeloid Leukemia programme: Supply disruption forces patients to get drugs from market
- 21Election stress may raise the risk of heart attacks. Here's how
- 22From rotten food to political opponents: Researchers explore how disgust relates to our beliefs, and why the connection is complicated
- 25Feet-stiffening socks could help you run further for longer
- 26Setting may shape psilocybin's effects on the brain, preliminary study suggests
- 27Eating Blueberries Every Day Could Reduce Depressive Symptoms in Older Adults
- 34Two kinds of political alienation pull support for violence in opposite directions, study finds
85 health and environment groups ask the WHO to lower its drinking-water nitrate limit, set in 1958 to prevent blue baby syndrome
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85 health and environment groups asked the World Health Organization on Tuesday to lower its nitrate limit for drinking water.
Nitrate is a natural chemical made of nitrogen and oxygen.
The WHO limit is 50 milligrams of nitrate a litre.
Who is involved
The World Health Organization (WHO)
the UN health agency; its drinking-water guidelines are the base most countries use, and the letter asks it to review nitrate
Who is involved
Denmark
its government's expert panel called the world limit too weak; it has committed to 6 milligrams a litre
Why it matters
Children
Pregnant women
Children and pregnant women are most at risk from high nitrate, the groups say.
How it works
Scientists split harm into acute, from a big dose now, and chronic, from small doses over years.
How it works
The WHO limit was set mainly against the acute harm to babies.
Seen it before
A sunburn shows up the same day, but years of sun can show up as skin damage decades later.
The truth
The Danish result is a link found in health records, which its authors say adds to earlier evidence.
The truth
A review of 25 reviews found unsafe water linked to cancers.
What comes next
The groups want nitrate added to the WHO's coming review of its drinking-water guidelines.
What's really going on
The world's limit for nitrate in drinking water was set in 1958 to stop an illness in babies, and most countries still copy it.
What's really going on
A study of 2.7 million Danes found more bowel cancer at a small fraction of that limit.
What's really going on
Denmark has already promised a much lower limit, and 85 groups now ask the WHO to follow.
Who gains
People in Denmark
Their government has already committed to a much lower nitrate limit than the rest of the world uses.
Who pays
Babies and pregnant women on high-nitrate water
They carry the most risk, the groups say.
Nobody knows yet
Whether the WHO will review its nitrate limit.
The letter asks for nitrate to join an upcoming review of the drinking-water guidelines, and the report carries no reply from the WHO.
Nobody knows yet
Which unit the Danish risk threshold is written in.
The Danish study gives 3.87 milligrams a litre.
Nobody knows yet
Why nitrate links show up for some cancers and not others.
The US thyroid cancer study called the evidence on its own question limited, and found no clear link.
The short version
That's the story in short.
The whole story has 5 more parts.
or swipe up for the next signalor scroll on for the next signal ↓
The whole story, in 5 parts ↓
Part 1 of 5
The limit was set to prevent blue baby syndrome.
Part 1 of 5
The groups say the limit has not been updated for newer evidence about small amounts drunk over many years.
Part 1 of 5
“at levels well below the current WHO limit”
Pratyush Kumar chairs WONCA, the world body of family doctors, which signed the letter.
Part 1 of 5
Greenpeace International
campaign group
WONCA
family doctors
Greenpeace International, a campaign group, also signed.
Part 2 of 5
The biggest study followed 2.7 million adults in Denmark, matched to tests of their tap water from 1978 to 2011.
Part 2 of 5
People with the most nitrate in their water had 16% more bowel cancer risk than those with the least.
Part 2 of 5
- 1Danish risk rises3.87 mg a litre
- 2WHO limit50 mg a litre
The risk was already higher above 3.87 milligrams a litre, far below the WHO's 50.
Part 2 of 5
Inside the body, nitrate can turn into N-nitroso compounds, which can cause cancer.
Part 3 of 5
A US study of 40,403 men found 22% more aggressive prostate cancer where water held the most nitrate.
Part 3 of 5
A study of thyroid cancer in the same group of US pesticide sprayers and their spouses found no clear link.
Part 3 of 5
In 54,804 Danes, more nitrate from tap water went with more dementia.
Part 3 of 5
Most of the nitrate people take in comes from leafy green and root vegetables, not from water.
Part 4 of 5
10 of 100
of the world's land: shallow groundwater over the WHO limit
By 2020, shallow groundwater was over the WHO limit under 10% of the world's land, a global model found.
Part 4 of 5
Groundwater is the main drinking water for up to 70% of the world's people.
Part 4 of 5
Nitrate stored in the soil keeps seeping down for decades.
Part 4 of 5
Spring
fertiliser goes on the fields
Rain
nitrate washes into the water
Early summer
town water spikes
In Iowa, a US farm state, small towns' water often spikes in nitrate in spring and early summer.
Part 4 of 5
Most places are far below the limit.
Part 5 of 5
An expert panel for Denmark's government said last year that the world limit does not protect health well enough.
Part 5 of 5
It advised a limit of 6 milligrams a litre.
Part 5 of 5
Most national governments base their water rules on the WHO's guidelines, the groups said.
9 sources
85 health and environment groups ask the WHO to lower its drinking-water nitrate limit, set in 1958 to prevent blue baby syndrome
- 1Cut down 'outdated' nitrate limit in drinking water, health and environmental groups tell WHO
- 2Nitrate in drinking water and colorectal cancer risk: A nationwide population-based cohort study
- 3The long tail of nitrate pollution in groundwater challenges governance of global water quality
- 4A National-Scale Historical Assessment of Nitrate in Public Drinking Water Supplies in New Zealand: Data Integration and Machine Learning Imputation Approaches
- 5Drinking water nitrate, disinfection byproducts, and prostate cancer incidence in the Agricultural Health Study
- 6Ingested nitrate and nitrite, drinking water disinfection by-products, and incidence of thyroid cancer among licensed pesticide applicators and spouses in the Agricultural Health Study
- 7Trends in nitrate levels in Iowa's community water systems (2000-2022): Characteristics of systems vulnerable to maximum contaminant level exceedances and future regulatory scenarios
- 8Source-specific nitrate intake and incident dementia in the Danish Diet, Cancer and Health Study
- 9Unsafe drinking water and human health: A global umbrella review of disease outcomes, intervention effectiveness, and policy implications
The full story
85 health and environment groups ask the WHO to lower its drinking-water nitrate limit, set in 1958 to prevent blue baby syndrome
85 health and environment groups asked the World Health Organization on Tuesday to lower its nitrate limit for drinking water.
The limit was set to prevent blue baby syndrome.
The biggest study followed 2.7 million adults in Denmark, matched to tests of their tap water from 1978 to 2011.
A US study of 40,403 men found 22% more aggressive prostate cancer where water held the most nitrate.
By 2020, shallow groundwater was over the WHO limit under 10% of the world's land, a global model found.
An expert panel for Denmark's government said last year that the world limit does not protect health well enough.
The groups want nitrate added to the WHO's coming review of its drinking-water guidelines.
Why it matters. Children and pregnant women are most at risk from high nitrate, the groups say.
A signal, seen in Mind & body
Small early studies that did not hold up
Seen in 2 of the 12 beats
A blueberry study of 18 older adults found no clear difference between the groups, and a psilocybin study of 15 people stopped early.
Also seen in Biotech.
With only a dozen or so people, a working treatment and a useless one can give results too alike to tell apart.
Births to stop at Daisy Hill on 23 November
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The vote
the trust board backs the move
23 Nov
births stop at Daisy Hill
A health trust in Northern Ireland voted to stop births at Daisy Hill Hospital in Newry from 23 November.
Births will move to Craigavon Hospital, which expects about 1,700 extra births.
2 of 8
permanent consultant obstetricians, of 8 needed
The Southern Health Trust says it needs 8 permanent consultant obstetricians, the senior doctors for births.
It will also have 3 temporary ones, called locums.
A 40-year-old pregnant woman asked the High Court on Tuesday to make the trust wait.
Checks before and after birth will stay at Daisy Hill.
How it got here
Before
some women already sent to Craigavon
23 Nov
all births move
Some women in rural South Down and South Armagh were already being sent to Craigavon to give birth.
Why it matters
A named midwife
Ambulance crews
Each woman will get a named midwife, and ambulance crews will choose which hospital to take her to.
How it works
Health planners call this consolidation: running a service from fewer sites when staff are too few for all.
How it works
The trust says that with too few consultants, it cannot safely run births at both hospitals.
Seen it before
A school with one music teacher for two buildings ends up teaching music in only one of them.
Who pays
Pregnant women around Newry
They must give birth further from home, at Craigavon.
Nobody knows yet
When births will return to Daisy Hill.
The trust calls the move temporary but has given no time frame for bringing births back.
1 source
Births to stop at Daisy Hill on 23 November
The full story
Births to stop at Daisy Hill on 23 November
A health trust in Northern Ireland voted to stop births at Daisy Hill Hospital in Newry from 23 November.
Why it matters. Each woman will get a named midwife, and ambulance crews will choose which hospital to take her to.
Powys may cut its hospital beds
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Powys, a rural county in Wales, may cut its community hospital beds from 146 to 90 or 60.
8 of 8
community hospitals with beds in Powys
Powys has no general hospital, only beds in 8 small community hospitals.
Beds would stay only in Brecon and Newtown, and possibly Llandrindod Wells.
Powys Teaching Health Board says small wards spread over a big county are hard to staff.
The average trip to a hospital bed would rise from about 12 minutes to 24.
What comes next
A 14-week public consultation runs until 10 January 2027.
Why it matters
More than a quarter of people in Powys are over 65.
How it works
Health planners weigh staff against distance: Powys finds 8 small wards hard to staff.
How it works
The board says fewer sites would be safer to run.
Seen it before
A town that shuts two of its three bus stops gets quicker buses and longer walks to them.
The truth
GPs, politicians and local people oppose the plan.
Who pays
Families of patients in rural Powys
Visiting a relative in a bed further away gets harder; one man says he could not have seen his dying wife.
1 source
Powys may cut its hospital beds
The full story
Powys may cut its hospital beds
Powys, a rural county in Wales, may cut its community hospital beds from 146 to 90 or 60.
Why it matters. More than a quarter of people in Powys are over 65.
A walk-in mental health centre's first months
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Hope Haven, a walk-in mental health centre in Whitehaven, England, is open 24 hours a day.
People need no diagnosis and no doctor's referral to use it.
About 3,000 people used it from March to July.
1 of 6
Hope Haven, one of 6 pilot centres
It is one of 6 pilot centres in England, part of the NHS's 10-year health plan.
Why it matters
Its area has about 20 suicides per 100,000 people, almost double the national rate.
Good news
Admissions to mental health wards in the area fell 24% from January to September, against last year.
How it works
Mental health services call this open access: anyone can walk in, at any hour, with no referral.
How it works
Nearly half its 3,000 users had never met NHS mental health services.
Seen it before
A shop with no queue and no membership card gets customers who never went in before.
What comes next
100 more centres are due to open, starting this autumn.
Nobody knows yet
Whether Hope Haven caused the fall in ward admissions.
The figure is an early one, and the formal evaluation of the 6 pilot centres is due later this year.
1 source
A walk-in mental health centre's first months
The full story
A walk-in mental health centre's first months
Hope Haven, a walk-in mental health centre in Whitehaven, England, is open 24 hours a day.
Why it matters. Its area has about 20 suicides per 100,000 people, almost double the national rate.
A new Belfast maternity hospital stays shut
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March 2024
the building is handed over
July 2024
bacteria found in the water
Now
still closed
A new maternity hospital in Belfast, Northern Ireland, has stayed closed since 2024 because of bacteria in its water.
The bacterium is Pseudomonas, which killed 3 babies at Belfast's Royal Jubilee Hospital in 2012.
Babies
People with weak immune systems
It rarely harms healthy people, but babies and people with weak immune systems are at risk.
Chemicals used to flush the bacteria out have damaged the pipes.
That could add almost 10 million pounds, taking the project past 100 million.
Why it matters
Mothers keep giving birth at the old Royal Jubilee hospital while the new one waits.
How it works
A report by engineers says the chemical dose used to kill the germs wore the valves out fast.
How it works
So the fix for one danger, Pseudomonas, created a second job: replacing more than 2,200 valves.
Seen it before
Scrubbing a pan with wire wool gets it clean, but doing it every day scratches through the pan.
The truth
The builders, Graham Construction and Bam Ireland, say every water test was clear when they handed it over.
What comes next
Now
valves being replaced
March 2027
part of the building may open
Part of the building may open by March 2027, if the repairs work.
Nobody knows yet
Who pays to repair the new Belfast maternity hospital.
The trust refused to say whether the builders or taxpayers meet the costs, citing talks with experts on liability.
1 source
A new Belfast maternity hospital stays shut
The full story
A new Belfast maternity hospital stays shut
A new maternity hospital in Belfast, Northern Ireland, has stayed closed since 2024 because of bacteria in its water.
Why it matters. Mothers keep giving birth at the old Royal Jubilee hospital while the new one waits.
People slept in cars for free care near Washington
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Dozens of people slept in their cars to get free care at a clinic near Washington DC on 17 October.
By 4am, about 80 cars had arrived for a clinic due to open at 6am.
The clinic saw 467 patients over the weekend, mostly for teeth and check-ups, and 99 had eye tests.
It was run by Remote Area Medical, a US charity whose volunteer doctors and dentists give free care.
94 of 100
of people in the area have health insurance
The area is well off: median household income tops $108,000, and about 94% have health insurance.
1 of 4
patients who had insurance
Still, 1 in 4 patients had insurance, but could not pay the costs it left them.
Why it matters
2 of 3
no usual place for care but the emergency room
Nearly 2 in 3 had no usual place for care except a hospital emergency room.
How it works
Health economists call them out-of-pocket costs: what a patient still pays with insurance, which brought insured people here.
How it works
Medicare, the US health plan for older people, does not cover routine dental care.
Seen it before
A phone plan with free calls still costs money if every text is charged extra.
The truth
Many of the clinic's figures come from Remote Area Medical's own survey of patients there.
Who gains
Families at the free clinic near Washington DC
Cheromie Johnson estimated free eye care for her and her son saved them more than $1,000.
Who pays
Insured patients near Washington DC
Their cover left dental and other costs they could not meet, so they queued overnight for free care.
1 source
People slept in cars for free care near Washington
The full story
People slept in cars for free care near Washington
Dozens of people slept in their cars to get free care at a clinic near Washington DC on 17 October.
Why it matters. Nearly 2 in 3 had no usual place for care except a hospital emergency room.
Kenya weighs the HPV vaccine for boys
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Who is involved
Ouma Oluga
Kenya's Medical Services Principal Secretary
Kenya may give the HPV vaccine to boys as well as girls, said Ouma Oluga, a senior health official.
HPV is a common virus passed on through sex.
Cervical cancer affects about 7,000 Kenyan women each year.
A new national survey found 59% of girls had a first dose, up from 30% in 2022.
20 of 100
of girls with the second dose
Only 20% had the recommended second dose.
Why it matters
Boys
Girls
Vaccinating boys also cuts how far the virus spreads, and protects boys from other HPV cancers.
How it works
Vaccine planners watch the drop between doses: 59% of girls got a first dose, but only 20% a second.
How it works
The news report blames weak follow-up, low awareness and poor access to vaccination.
Seen it before
A school trip in two parts loses a few pupils who never bring back the second form.
What comes next
Kenya's government has set no timeline for vaccinating boys.
Good news
In Kenya, the share of girls with a first dose of the HPV vaccine, which protects against the virus behind most cervical cancer, rose from 30% in 2022 to 59%.
1 source
Kenya weighs the HPV vaccine for boys
The full story
Kenya weighs the HPV vaccine for boys
Kenya may give the HPV vaccine to boys as well as girls, said Ouma Oluga, a senior health official.
Why it matters. Vaccinating boys also cuts how far the virus spreads, and protects boys from other HPV cancers.
Israel's health report shows gaps by income
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Israel's yearly report on community health care, published on Tuesday, found wide gaps between rich and poor.
Among women, 36.8% of the poorest group were obese, against 19.1% of the richest.
Cervical cancer screening reached 80.3% of the richest women and 49.7% of the poorest.
Obesity among 7-year-olds rose to 8.6%, the highest since tracking began in 2014.
Antidepressant buying rose about 14% since 2022, and 29% among Arab citizens.
Why it matters
The gaps also run between central Israel and outlying areas, and between Jewish and Arab communities.
How it works
Public health researchers call gaps like this health inequalities: worse health for people with less money, as here.
How it works
Among Israeli women, obesity nearly doubles from the richest group to the poorest.
Seen it before
In a game where richer players start with better kit, they tend to finish higher.
Good news
In Israel, more women in every group are being screened for cervical cancer, and deaths from it are falling, the head of the national health report said.
1 source
Israel's health report shows gaps by income
The full story
Israel's health report shows gaps by income
Israel's yearly report on community health care, published on Tuesday, found wide gaps between rich and poor.
Why it matters. The gaps also run between central Israel and outlying areas, and between Jewish and Arab communities.
Punjab's free blood-cancer drugs run out
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Punjab, a Pakistani province, has not handed out its free blood-cancer drugs for about 3 months.
About 5,000 patients with chronic myeloid leukaemia, a blood cancer, are registered for them.
5 of 5
hospitals that hand out the drugs
They collect the drugs every month at 5 hospitals, including Mayo Hospital in Lahore.
Patients now buy the costly drugs in shops, where they are also short.
Officials blame a delayed tender, the bidding process used to buy the drugs.
Doctors had asked the province to widen its list of cancer drugs from 4 to 27.
Why it matters
Most patients cannot afford to keep buying the drugs, doctors warned.
How it works
Health systems call it central procurement: one department buys for every centre, as Punjab's now does.
How it works
0 of 5
centres with the drugs now
So one delayed tender left all 5 centres without the drugs at once.
Seen it before
If the one person who does a family's shopping misses a week, the whole house runs out at once.
What comes next
Hospitals may now buy the drugs locally as a stop-gap.
Who gains
Shops selling cancer drugs in Punjab
Patients who got the drugs free must now buy them on the open market.
Who pays
Blood cancer patients in Punjab
They now pay shop prices for drugs the province promised free.
Nobody knows yet
When Punjab's patients will get their free drugs back.
The health minister hopes it will be resolved very soon, but the tender may take more time.
1 source
Punjab's free blood-cancer drugs run out
The full story
Punjab's free blood-cancer drugs run out
Punjab, a Pakistani province, has not handed out its free blood-cancer drugs for about 3 months.
Why it matters. Most patients cannot afford to keep buying the drugs, doctors warned.
France writes to every 29-year-old about fertility
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France will send a letter about fertility to every woman and man aged 29 by the end of November.
Assurance Maladie
France's public health insurer
It comes from Assurance Maladie, France's public health insurer.
It invites people who want children to see a health worker before trying for a baby.
It advises seeing a specialist after 1 year of trying before 35, or 6 months at 35 and over.
Health minister Stephanie Rist says 15% to 25% of French couples who want a child have difficulty.
Last year more than 20,000 women asked to freeze their eggs, up 30% in a year.
Why it matters
- 1Shortest wait14 months
- 2Longest wait24 months
Waits to freeze eggs run from 14 to 24 months, depending on the region.
How it works
- 1Eggs can be stored from29 age
- 2Stored until37 age
- 3Used up to45 age
Doctors call age a decisive factor in fertility: France stores eggs from 29 to 37, for use up to 45.
The truth
1 of 16
measures in February's fertility plan
The letter is one of 16 measures in a plan from February, so it is not new policy.
The truth
“demographic rearmament”
The plan followed President Emmanuel Macron's 2024 call for "demographic rearmament", a push for more births.
1 source
France writes to every 29-year-old about fertility
The full story
France writes to every 29-year-old about fertility
France will send a letter about fertility to every woman and man aged 29 by the end of November.
Why it matters. Waits to freeze eggs run from 14 to 24 months, depending on the region.
A first-time marathon runner dies of muscle breakdown
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Rachel Apa, 24, died after collapsing near the end of Sunday's New York City Marathon, her father said.
It was her first marathon.
“Ow, ow”
At mile 18 she texted her father "Ow", and a mile later "Ow, ow".
A member of the public gave her CPR, and race medics used a defibrillator.
She died that night at Mount Sinai hospital of rhabdomyolysis, her father said.
Why it matters
Apa played college field hockey and trained for months, so the risk can reach fit athletes.
Why it matters
About 26,000 cases are reported in the US each year, research suggests.
How it works
Doctors call it rhabdomyolysis, or rhabdo: muscle breaking down, often after very hard exercise.
How it works
Broken-down muscle releases waste into the blood.
Seen it before
A sink drains a trickle all day, but a burst pipe floods it faster than it can drain.
Warning signs include cramps, unexpected pain and dark urine, hours or days after exercise, the CDC says.
How it got here
2024
a runner dies after a medical incident
Sunday
Rachel Apa dies
New York Road Runners, which runs the race, said a runner last died after a medical incident in 2024.
2 sources
A first-time marathon runner dies of muscle breakdown
The full story
A first-time marathon runner dies of muscle breakdown
Rachel Apa, 24, died after collapsing near the end of Sunday's New York City Marathon, her father said.
Why it matters. Apa played college field hockey and trained for months, so the risk can reach fit athletes.
Elections and the heart
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Studies of 2 US elections found more heart trouble around voting day, STAT, a US health news site, reports.
In North Carolina in 2016, people with heart devices had 77% more irregular beats around the vote.
After the 2020 vote, heart attacks rose at Kaiser Permanente, a big California health provider.
Democrats and Republicans had a similar risk.
Why it matters
Nearly half of US adults have some heart or blood vessel disease, including high blood pressure.
How it works
Cardiologists call it acute stress: anger and fear set off the body's fight-or-flight response.
How it works
Adrenaline, a stress chemical, rises, and the vagus nerve, which slows the heart, eases off.
Seen it before
A heart pounds before a big exam, even when the pupil is sitting still.
The truth
The studies show a link with elections, not proof that elections cause heart attacks.
The full story
Elections and the heart
Studies of 2 US elections found more heart trouble around voting day, STAT, a US health news site, reports.
Why it matters. Nearly half of US adults have some heart or blood vessel disease, including high blood pressure.
Disgust, the body and politics
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A study of 632 US adults tested how disgust, awareness of the body and politics fit together, DW reports.
People more easily disgusted by sex tended to be more conservative.
Moral disgust, at wrongdoing like cruelty, went with conservatism only in people less aware of their bodies.
Disgust at germs, like rotten food, showed no clear link to politics in this study.
An older review of 24 studies found easily disgusted people leaned socially conservative.
How it got here
Disgust probably evolved to keep people away from things that could make them sick, said psychologist Yoel Inbar.
Why it matters
Tsakiris says people unsure what their body's feelings mean may be easier to sway by messages that name them.
How it works
Psychologists call sensing the body's own signals, like hunger or a racing heart, interoception.
How it works
“doesn't arrive with a label”
A signal "doesn't arrive with a label", said Manos Tsakiris of Royal Holloway, a London university.
Seen it before
A churning stomach before a match can feel like fear or like excitement, depending on how a player reads it.
The truth
“suggestive at best”
Inbar called the new findings "suggestive at best" and said the link is small.
1 source
Disgust, the body and politics
The full story
Disgust, the body and politics
A study of 632 US adults tested how disgust, awareness of the body and politics fit together, DW reports.
Why it matters. Tsakiris says people unsure what their body's feelings mean may be easier to sway by messages that name them.
Ultra-processed food and children's brains
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Children who ate more ultra-processed food had stronger brain reward responses to food pictures, a study found.
Ultra-processed foods are factory-made, like packaged bread and breakfast cereal.
67 of 100
of US children's calories
They make up about 67% of the calories US children eat.
A University of Southern California team scanned 46 children aged 7 to 10, all a healthy weight at first.
Children with stronger responses in the dorsal striatum, a reward area, gained more body fat over a year.
Why it matters
Children's brains and food habits are still forming, said Kathleen Page, who led the study.
How it works
Statisticians call this a mediation test: allowing for the brain response made the food-to-weight link 31% weaker.
How it works
For body fat, the link fell by 44%.
The truth
The study watched children and cannot show the foods cause the brain response or the weight gain.
What comes next
The team plans a trial that swaps in less processed foods.
1 source
Ultra-processed food and children's brains
The full story
Ultra-processed food and children's brains
Children who ate more ultra-processed food had stronger brain reward responses to food pictures, a study found.
Why it matters. Children's brains and food habits are still forming, said Kathleen Page, who led the study.
A vibrating mattress and the brain's cleaning system
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A vibrating mattress plus a nitric oxide pill boosted the brain's waste clearance in a small study, New Scientist reports.
The glymphatic system is the brain's cleaning system.
The pill and the shaking made the brain's blood vessels swell and tighten more strongly.
A team led by Vesa Kiviniemi at the University of Oulu in Finland tested 29 adults without memory problems.
6 of 29
of the 29 had mild side effects
6 had mild side effects such as nausea and headache.
Why it matters
Researchers are testing many ways to boost this cleaning, from ultrasound to pink noise, hoping one will help patients.
How it works
Brain scientists link the clearing to the beat of blood vessels: stronger swelling and tightening cleared more protein.
Seen it before
Squeezing a sponge again and again pushes out more dirty water than a single squeeze.
The truth
Kiviniemi warned that nitric oxide can lower blood pressure, and that such risky methods should not be tried at home.
What comes next
The team hopes to test it in 60 people with memory problems or Alzheimer's next year.
How it works
Why a small first study cannot show whether a treatment works
How it works
Researchers call it statistical power: with too few people, a treatment that works and one that does nothing give results too alike to tell apart.
How it works · step 1 of 5
People differ, so any group's average shifts a little by chance
How it works · step 2 of 5
With few people, those chance shifts are large
How it works · step 3 of 5
A treatment that works and one that does nothing then give similar results
How it works · step 4 of 5
So a small study can neither show an effect nor rule one out
How it works · step 5 of 5
Its real job is to test the plan and work out how big the next study must be
The twist
A small study that finds no difference has not shown the treatment fails. With so few people, a treatment that works could have given the same result.
The picture
How many people took part in five of today's studies. Each is too small to settle whether the thing it tested works.
Seen the same day
With only 18 people, mood did not differ clearly between groups, and the authors say the pilot was built to size a bigger trial.
Seen the same day
With 15 people, a planned check partway through found the study unlikely to reach its target, so it stopped.
Seen the same day
29 healthy adults could show the method changes the brain's clearing; whether it helps Alzheimer's waits for a trial of 60 patients.
Seen the same day
12 adults showed a saving, and the 1 to 2 minutes off a marathon is an estimate, not a measured result.
The catch
A big study fixes the problem of chance, not every problem: if the groups differ or the wrong thing is measured, thousands of people can still mislead.
The whole
The 18 older people who took blueberry powder gave their time to a question none of them could answer alone.
The whole
Each study today is one small piece, and the answer needs the next, larger group of people too.
1 source
A vibrating mattress and the brain's cleaning system
The full story
A vibrating mattress and the brain's cleaning system
A vibrating mattress plus a nitric oxide pill boosted the brain's waste clearance in a small study, New Scientist reports.
Why it matters. Researchers are testing many ways to boost this cleaning, from ultrasound to pink noise, hoping one will help patients.
Socks that stiffen the foot
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Socks with tight bands around the ball of the foot made walking and running easier, a small study found.
Who is involved
Owen Beck
Hui Tang
Owen Beck and Hui Tang at the University of Texas at Austin designed them.
The energy saved equals what an average person would save by losing 2 kilograms, they say.
12 of 12
healthy adults tested
They tested 12 healthy adults in the new socks, in normal socks and in no socks.
Beck estimates the socks could cut 1 to 2 minutes off a marathon.
Why it matters
Beck hopes elite runners will wear the socks at the 2028 Los Angeles Olympics.
How it works
Biomechanists say human feet grew stiffer than other apes' feet, which helped people walk upright.
How it works
Earlier stiff shoes and inserts failed to save effort, so the team stiffened the foot itself with a sock.
Seen it before
A stiff-soled shoe pushes off a step better than a floppy slipper.
The truth
The 1 to 2 minutes is Beck's own rough estimate, not a race result.
How it works
12 adults showed a saving, and the 1 to 2 minutes off a marathon is an estimate, not a measured result.
The idea, in story 15: Why a small first study cannot show whether a treatment works →The full story
Socks that stiffen the foot
Socks with tight bands around the ball of the foot made walking and running easier, a small study found.
Why it matters. Beck hopes elite runners will wear the socks at the 2028 Los Angeles Olympics.
Where psilocybin is taken may matter
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Psilocybin is the drug in magic mushrooms.
Copenhagen University Hospital tested 15 healthy adults.
The first 5 took it lying in a brain scanner.
Those in the calm room had more intense experiences and bigger changes in the marker.
Across all 15, the average change was small, about 2% to 3%.
Why it matters
The authors say the finding matters for therapies that use psychedelics.
How it works
Researchers call it an interim analysis: a planned check partway through on whether a study can still reach its goal.
How it works
This one stopped early, because the check found it was unlikely to reach its target.
Seen it before
A cook tastes a soup halfway through and stops if it cannot be saved.
The truth
There was no placebo group, and people were not randomly put in either room.
How it works
With 15 people, a planned check partway through found the study unlikely to reach its target, so it stopped.
The idea, in story 15: Why a small first study cannot show whether a treatment works →Nobody knows yet
Whether blueberry powder or a calm room does anything at all.
The blueberry pilot was built to plan a bigger trial, and the psilocybin study stopped early.
2 sources
Where psilocybin is taken may matter
The full story
Where psilocybin is taken may matter
Psilocybin is the drug in magic mushrooms.
Why it matters. The authors say the finding matters for therapies that use psychedelics.
Blueberries and low mood, in 18 people
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A pilot study led by Harvard Medical School tested blueberry powder on depression in 18 adults over 65.
Each day they took 48 grams of blueberry powder, about 2 cups of berries, or a dummy powder.
Mood scores did not differ clearly between the 2 groups.
The blueberry group's scores did improve more, and more evenly, the authors wrote.
The authors say the pilot was built to test the plan and to size a bigger trial.
Most of the 18 were white women with mild symptoms, not diagnosed depression.
Why it matters
It hints at a link between gut bacteria and mood, which scientists are still working out.
The truth
The placebo group may have felt better just from expecting help, ScienceAlert notes.
How it works
With only 18 people, mood did not differ clearly between groups, and the authors say the pilot was built to size a bigger trial.
The idea, in story 15: Why a small first study cannot show whether a treatment works →1 source
Blueberries and low mood, in 18 people
The full story
Blueberries and low mood, in 18 people
A pilot study led by Harvard Medical School tested blueberry powder on depression in 18 adults over 65.
Why it matters. It hints at a link between gut bacteria and mood, which scientists are still working out.
Reframing a texture calms an autistic brain
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Describing an unpleasant texture like a news reporter calmed touch areas of the brain in autistic youth, a study found.
It compared 47 autistic and 45 non-autistic children aged 8 to 15.
In brain scans, they felt scratchy artificial grass and a wool sweater.
The reframing did not make the textures feel less unpleasant straight away.
Sensory over-responsivity means strong distress at everyday sensations, like clothing tags.
Why it matters
Few proven treatments exist for this distress, which disrupts routines, friendships and well-being.
How it works
Psychologists call this cognitive reframing: describing a feeling differently to change how the brain handles it.
How it works
Here the scans showed less activity in touch and sound areas, before the children felt any better.
Seen it before
Calling a dentist's drill a buzzing noise, not pain, can make it easier to sit through.
The truth
Children with milder sensory problems showed the bigger brain changes.
1 source
Reframing a texture calms an autistic brain
The full story
Reframing a texture calms an autistic brain
Describing an unpleasant texture like a news reporter calmed touch areas of the brain in autistic youth, a study found.
Why it matters. Few proven treatments exist for this distress, which disrupts routines, friendships and well-being.
Cannabis use follows the menstrual cycle
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Ovulation
use rises
Before a period
use rises most
Cannabis use rose before periods and around ovulation in people with premenstrual symptoms, a study in Addictive Behaviors found.
Ovulation is when an ovary releases an egg.
64 people aged 18 to 42 in Canada and the US logged their use every evening.
Use rose most on days of stronger emotional sensitivity or arguments with others.
83 of 100
with another psychiatric diagnosis
About 83% of the group had another psychiatric diagnosis.
Why it matters
People with premenstrual disorders
For people with severe premenstrual symptoms, cannabis use rose on exactly the days that were hardest.
How it works
Doctors describe severe premenstrual mood change as a strong sensitivity to normal hormone shifts.
How it works
So use rose on the days symptoms peaked, as people may manage them with cannabis.
The truth
The 64 were recruited through a premenstrual-disorder advocacy group's social media, so they were already seeking help.
1 source
Cannabis use follows the menstrual cycle
The full story
Cannabis use follows the menstrual cycle
Cannabis use rose before periods and around ovulation in people with premenstrual symptoms, a study in Addictive Behaviors found.
Why it matters. For people with severe premenstrual symptoms, cannabis use rose on exactly the days that were hardest.
Why a touch can bring sudden sadness
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Some people feel a sudden burst of sadness when a nipple is touched, a feeling called Sad Nipple Syndrome.
It usually passes within a couple of minutes.
It is not an official diagnosis, and there are no studies of it yet.
A similar feeling during breastfeeding, as milk starts to flow, is called D-MER.
Who is involved
Alia Macrina Heise
lactation consultant
Lactation consultant Alia Macrina Heise says the two feel identical.
Why it matters
Breastfeeding mothers
Men
Breastfeeding mothers and men alike have searched online for an explanation, the Guardian reports.
How it works
A gynaecologist, Vladimir Kraus, thinks oxytocin, a bonding hormone, is involved, because nipple touch releases it.
How it works
Heise's theory is a brief misstep in dopamine, a brain chemical that steadies mood.
The truth
Both are theories: research on the syndrome itself is still missing.
1 source
Why a touch can bring sudden sadness
The full story
Why a touch can bring sudden sadness
Some people feel a sudden burst of sadness when a nipple is touched, a feeling called Sad Nipple Syndrome.
Why it matters. Breastfeeding mothers and men alike have searched online for an explanation, the Guardian reports.
Sunscreen fears on TikTok
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Some social media users are swapping sunscreen for beef tallow or kitchen oils, The Conversation reports.
87 of 100
of 971 sunscreen TikToks promoted it
A 2026 study of 971 popular TikToks about sunscreen found almost 87% promoted it.
Only 6% criticised it on health grounds, but those got far more likes and shares.
Some sunscreen filters reach the blood, and some acted like hormones in lab tests.
Who is involved
Charareh Pourzand
University of Bath
That does not show normal use harms people, says Charareh Pourzand, a skin researcher at the University of Bath.
The UK recently restricted one filter, 4-MBC, after a safety review.
Why it matters
Swapping a tested sunscreen for kitchen oils leaves skin with protection nobody has measured.
How it works
Skin scientists have strong evidence that ultraviolet light damages skin and raises skin cancer risk.
How it works
A homemade mix may block some ultraviolet, but nobody knows how reliably without proper testing.
Seen it before
A raincoat stitched at home might keep some rain off, but nobody knows until the first storm.
The truth
Sunscreen does limit the UVB light skin uses to make vitamin D.
Who gains
Accounts that attack sunscreen online
Attention rewards them: a rare kind of video earns the most reactions.
1 source
Sunscreen fears on TikTok
The full story
Sunscreen fears on TikTok
Some social media users are swapping sunscreen for beef tallow or kitchen oils, The Conversation reports.
Why it matters. Swapping a tested sunscreen for kitchen oils leaves skin with protection nobody has measured.
Weight-loss drug advice from strangers online
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48 of 100
of those surveyed used social media for drug information
Nearly half of 684 UK adults surveyed, 48%, got information on weight-loss drugs from social media.
Most of them, 544, were current or past users of drugs like Wegovy or Mounjaro.
They asked health workers less often.
24 of 100
of views were of accurate videos
An October study of 194 popular weight-loss drug videos found only 24% of views were of accurate ones.
Also in October, the UK medicines regulator seized more than 12,000 fake weight-loss pens in Birmingham.
Why it matters
Fake pens can hold the wrong ingredients, the wrong dose or harmful contaminants.
How it works
Psychologists call it social identity: people trust advice from those they see as their own group.
How it works
A person may have done well on a drug without knowing its risks, or whether their result is typical.
Seen it before
A friend's favourite restaurant can feel like a safer pick than a stranger's review.
The truth
The survey cannot say how common this is across the UK, its author notes.
Who gains
Sellers of unlicensed weight-loss drugs
Online recommendations can send people to drugs outside regulated pharmacies, the article warns.
1 source
Weight-loss drug advice from strangers online
The full story
Weight-loss drug advice from strangers online
Nearly half of 684 UK adults surveyed, 48%, got information on weight-loss drugs from social media.
Why it matters. Fake pens can hold the wrong ingredients, the wrong dose or harmful contaminants.
Bone loss starts before the last period
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Bone loss can speed up before a woman's last period, a bone researcher writes in The Conversation.
1 year before
loss speeds up
The last period
fastest loss
2 years after
loss slows
In 862 US women, spine and hip bone was lost fastest from 1 year before the last period.
Menopause is confirmed only after 12 months without a period.
Osteoporosis, bone that has become fragile and porous, often shows no sign until a bone breaks.
A US expert panel recommends osteoporosis screening for women aged 65 and over.
Why it matters
Bone loss can speed up before a woman knows her last period was her last.
How it works
Bone biologists call it remodelling: some cells remove old bone while others build its replacement.
How it works
Oestrogen helps keep the two in balance.
Seen it before
A shop that sells faster than it restocks slowly empties its shelves.
The truth
An exercise trial improved bone density, but did not show it meant fewer broken bones.
1 source
Bone loss starts before the last period
The full story
Bone loss starts before the last period
Bone loss can speed up before a woman's last period, a bone researcher writes in The Conversation.
Why it matters. Bone loss can speed up before a woman knows her last period was her last.
Feeling shut out and backing violence
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People who felt their group was shut out of society were more likely to back political violence, a survey found.
It asked 5,501 adults in the UK, the Netherlands, Denmark and Norway, from 2021 to 2023.
About 8.5% strongly agreed that people sometimes need to use violence.
Who is involved
Tahir Abbas
Aston University
Tahir Abbas of Aston University in the UK wrote the paper.
Feeling cut off from politics did not, on its own, go with support for violence.
Why it matters
Abbas suggests that helping people feel they can change things may weaken the link more than building trust.
How it works
Psychologists call it a moderator: something that changes how strong a link is, as two kinds of distrust did here.
How it works
Feeling powerless made the link between exclusion and violence stronger.
Seen it before
Wind makes a cold day feel colder, and sunshine makes the same cold feel milder.
The truth
The survey cannot show what causes support for violence, and it asked about views, not actions.
1 source
Feeling shut out and backing violence
The full story
Feeling shut out and backing violence
People who felt their group was shut out of society were more likely to back political violence, a survey found.
Why it matters. Abbas suggests that helping people feel they can change things may weaken the link more than building trust.
That's the whole Mind & body day.
25 stories, 34 sources.