There are a lot of reasons why obesity has taken off over the last 30 years, but one very obvious reason is that food — especially fat food — is so cheap:
Food is cheaper here than almost anywhere else. In 2007, only about 6.9
percent of U.S. consumer spending went for food at home; Germans spent
more (11.4 percent), as did Italians (14.5 percent) and Mexicans (24.2
percent). On the other hand, low food prices may contribute to
Americans’ obesity. In 2006, about 34 percent of U.S. adults were
judged obese, triple France’s rate (10.5 percent) and four times that
of Switzerland (7.7 percent)
But why is food so cheap in the United States?
As Bryan Walsh explains in this excellent TIME article, it starts with
corn. American corn production has tripled in the past 40 years, from 4
billion bu. in 1970 to 12 billion. Billions of dollars of subsidies
have injected steroids into corn production, and our farmers have
injected chemicals into our fields — “American farmers now produce an
astounding 153 bu. of corn per acre, up from 118 as recently as 1990.”
Money might be scarce, but cheap food is abundant. As a result, food
expenditures as a percentage of income have fallen by half in the last
half-century, and obesity rates have doubled.
Two graphs, just to drive the point home. The cheap food revolution
hasn’t just given low-income families cheaper options. It’s come at the
expense of healthier food. A dollar today buys 1,200 calories of potato
chips and 250 calories of vegetables or 170 calories of fresh fruit.
Walsh gets it right: “it simply costs too much to be thin.”
The
cheap food revolution has aided the fast food revolution. Countries
with fast food chains that piggy-backed on the corn boom have become
more efficient eaters. But we’re learning to be efficient in the wrong
ways. By cramming as many calories into a dollar and a minute as
possible, our evolutionary instinct to maximize our calorie intake is
suddenly working against us.






