A flesh-eating pest is back in US cattle, and the beef trade is already moving

Food & Farming 5 min 80 sources

A parasite eradicated 60 years ago turned up in Texas cattle this week, triggering border bans and price moves — one of several shocks, from the Iran war to a nervous corn crop, reshaping what food costs.

Key takeaways

The New World screwworm, a flesh-eating parasite eradicated from the US in the 1960s, was confirmed in Texas cattle this week, triggering a Canadian ban on Texas livestock, a Texas state of disaster, and rerouted cattle trade that's already moving beef prices.
The Iran war is reaching the farm — squeezing fertilizer (pushing some farmers to cow dung and compost) and pistachios — while a slow, patchy US corn crop is an early signal worth watching, because corn feeds livestock and fills processed foods.
A UN report shows the world eats six times more chicken than in 1961, driven by chicken's feed efficiency; meanwhile policy quietly shapes the food supply, and a much-shared fries-and-diabetes study is a reminder that one observational result is a clue, not proof.

A parasite the US beat in the 1960s is back

The New World screwworm has been confirmed in US cattle for the first time since the 1960s [80]. It’s a fly whose larvae burrow into the living flesh of animals and, rarely, people. It was found in a three-week-old calf in La Pryor, South Texas, then in a second calf [80][51]. Texas Governor Greg Abbott declared a state of disaster, warning it is “likely to spread over the summer” [51].

The system here is both biological and commercial. The US wiped out the screwworm decades ago using a clever trick — releasing millions of sterile male flies so females mate but produce no offspring [80]. Its return matters because a single confirmed case triggers a wall of trade barriers. Canada immediately banned cattle that had been in Texas in the prior 21 days [51]. The US had already closed its border to Mexican livestock a year ago to keep the pest out [38].

Those closures reroute the whole cattle trade. A 70-year-old feedlot in Lubbock, Texas now sits with empty pens, starved of the Mexican cattle it relied on, while the profits shift south to Mexico [38]. Cattle prices are rallying [66]. The angle for anyone who eats beef: a single fly in one calf can push the price of a burger. The response to it is to shut borders and reshuffle supply.

The Iran war reaches all the way to the field

The war between the US and Iran, and Iran’s blockade of the Strait of Hormuz, is now showing up in farming. Two ways stand out. Fertilizer has grown scarce and costly, and some farmers are falling back on alternatives like cow dung and compost [42]. And pistachios are caught in a squeeze — Iran is one of the world’s top growers [20]. The war is disrupting exports just as a viral “Dubai chocolate” craze drives demand through the roof [20].

The system is dependence on a few sources. Modern farming runs on globally-traded inputs, and synthetic fertilizer is essentially made from energy [42]. So when a war spikes energy and chokes a shipping lane, the fertilizer price follows [42]. And when a handful of countries grow most of a crop, losing one to conflict leaves no slack [20]. The US, Turkey and Iran all reported weaker pistachio harvests, and the market has tightened into shortage [20]. A war in the Gulf is also a line item on a farm’s input bill and a squeeze on a snack.

Why the corn crop has farmers watching the sky

In the US Midwest, the corn crop is off to an uneven start. Nationwide, 76% of corn had emerged by early June, but eight key states are lagging — Colorado, Michigan and Pennsylvania among them [9]. A couple of states still had more than a quarter of their corn left to plant [5]. The USDA released its first crop condition ratings of the year [3].

Here’s why a slow start in the Corn Belt matters far beyond it. Corn is a commodity — a bulk good priced globally, where a shortfall anywhere moves the price everywhere. And corn isn’t just corn on the cob. It feeds the cattle, pigs and chickens that become meat, and it turns up in a vast range of processed foods and sweeteners. So a cold, wet, patchy spring is a number worth watching now, because a weaker harvest would ripple into meat and grocery prices months later. The caveat: it’s early, and condition ratings this far out are provisional, not a forecast.

The century the world switched to chicken

A UN report this week quietly captured one of the biggest shifts in how humans eat. The average person now consumes about six times as much chicken as their grandparents’ generation did [33]. Poultry supply rose from under 3kg a person in 1961 to 17kg in 2022, according to the Food and Agriculture Organization [33]. Pork doubled; beef, the most polluting, held steady [33].

The mechanism behind chicken’s rise is efficiency. A chicken converts feed into meat far more cheaply than a cow, using less feed, land and water per kilo. So as the world grew richer and hungrier, it grew chicken-er. That single fact reshaped farming into vast intensive poultry operations and pushed up demand for the corn and soy that feed the birds. Global meat supply has quadrupled in 60 years and is still climbing [33]. Agriculture remains the second most polluting sector, with emissions forecast to rise another 7.6% in the next decade [33].

Washington’s quiet hand on your plate

A cluster of policy moves this week showed how much of food is decided in government, not on the farm. The USDA cut a program that helped local food economies connect farms to nearby buyers [23]. Congress is weighing whether to roll back farm-animal-welfare rules [17]. And with farm costs rising, the US cut tariffs on imported agricultural equipment [55].

The system is that food passes through policy at every step — subsidies, trade rules, welfare standards, local-food grants. Each lever quietly shapes what gets grown, how animals are raised, and what lands on the shelf. None of it makes a dramatic headline the way a drought or a recall does. But a tariff cut on tractors, or a defunded local-food program, reaches your plate just as surely — only slower, and out of sight.

How to read a scary food study

End with a caution, because this week brought a textbook example. A large study in the BMJ tracked more than 205,000 people for nearly 40 years [19]. It found that eating three servings of french fries a week was associated with a 20% higher risk of type 2 diabetes [19]. Baked, boiled or mashed potatoes showed no significant rise [19].

The useful lesson isn’t about potatoes; it’s about reading. This was an observational study — it found an association, not proof that fries cause diabetes, and people who eat lots of fries may differ in other ways. That’s why nutrition science rarely crowns a food good or bad on one result [11]. Researchers increasingly stress the “food matrix”: how a nutrient behaves depends on the whole food it sits in, not the nutrient alone [11]. When a headline says a food causes or cures something, the honest questions are: which study, what kind, and in whom. One result is a clue, not a verdict.

02 · Lesson · why it matters

Every efficiency has a hidden bill

When a system is tuned to maximize one thing — cheapness, speed, yield — the cost it seems to remove doesn't vanish. It moves somewhere you're not looking, and comes due later.

A miracle that keeps transmitting shocks

Our food system is one of history’s great optimizations. Food has never been cheaper or more plentiful, and the average person now eats six times more chicken than their grandparents did. By the one measure it was built for — cheap calories for billions — it is a staggering success.

And yet this week it kept carrying shocks from everywhere straight to the dinner table. A single fly in one Texas calf. A war in a strait thousands of miles away. A cold, wet spring in the Midwest. Each one reached into the price of beef, fertilizer, pistachios, groceries. The same machine that made food so cheap is the one that can deliver a distant shock to your plate within days.

That is not bad luck. It’s the bill for the optimization, arriving.

The cost doesn’t vanish — it relocates

Here is the principle worth carrying out of the kitchen. When you tune any system hard for a single goal, you don’t make the cost disappear. You move it.

We optimized food for cheapness and abundance. That meant fewer and bigger producers, global sourcing, and stripping out anything that looked like waste. It worked — the price came down. But the cost it seemed to remove didn’t evaporate. It reappeared elsewhere, on ledgers nobody was watching: as fragility, as pollution, as risk. Optimization is mostly the art of pushing a cost somewhere it won’t show up in the number you’re trying to shrink.

The first hidden bill: slack was the price of cheapness

To make food cheap, the system deleted its slack — the spare suppliers, the buffer stocks, the local redundancy. On an efficiency ledger, slack looks like pure waste, so optimization always cuts it first.

But slack is exactly what absorbs a shock. It’s the cushion. Remove it, and a fly in one calf, or a blockade in one shipping lane, has nothing to land on. A local hit becomes a global price move, with no buffer in between. The cheapness and the fragility aren’t two separate facts about the food system. They are the same decision, seen from opposite sides.

The second hidden bill: the costs pushed off the ledger

The chicken miracle is real. Chicken converts feed to meat more efficiently than any other large animal, so the world rationally tilted toward it. By the efficiency measure, that’s the right answer.

But that ledger never counted the rest. Not the pollution — agriculture is the second most polluting sector on earth. Not the monoculture, or the narrowing of the human diet down to a few hyper-efficient products. Those costs are entirely real. They’re just not in the price you pay at the till. Optimization is brilliant at parking its costs in places that don’t appear in the figure it’s optimizing — which is precisely why they’re so easy to ignore.

And the bill is deferred, which is the trap

The costs of an optimization usually don’t just move sideways. They move into the future. That delay is what makes them so easy to keep banking against.

Cheap fertilizer for decades — then a sudden spike when a crisis hits the energy it’s made from. A food engineered to be cheap and moreish — and a health cost that shows up years later, slowly. Even a big study can often only call it an association, not proof. We take the savings now and pay the bill on a lag. So the efficiency feels free, right up until the moment it isn’t.

Read the whole ledger

None of this is an argument against efficiency. Efficiency fed the world; that is not nothing. It’s an argument for honesty about the full ledger, not just the line you were watching.

So whenever something has been made dramatically cheaper, faster, or more efficient, don’t stop at “isn’t this great?” That goes for a food, a supply chain, a budget, a schedule, a body pushed to do more on less. The useful question is “where did the cost go, and when does it come due?” Because it didn’t disappear. The food system just shows it most clearly: every efficiency has a hidden bill, and the only real choice is whether you find it before it finds you.

03 · Lab · your turn

The Lean Larder

Optimize a food supply for cheapness and watch the everyday price fall as hidden fragility rises, then live through a year of shocks and feel the deferred bill of over-efficiency come due.