Why are we so fat

Elizabeth Colbert at the New Yorker, reviews two books that deal with why we have grown fatter over the years.

Fat; Obesity; “The Evolution of Obesity” (Johns Hopkins; $40); Michael L. Power; Jay Schulkin; “The Fattening of America” (Wiley; $26.95); Eric Finkelstein One of the most comprehensive data sets available about Americans—how tall they are, when they last visited a dentist, what sort of cereal they eat for breakfast, whether they have to pee during the night, and, if so, how often—comes from a series of studies conducted by the federal Centers for Disease Control and Prevention. Participants are chosen at random, interviewed at length, and subjected to a battery of tests in special trailers that the C.D.C. hauls around the country. The studies, known as the National Health and Nutrition Examination Surveys, began during the Eisenhower Administration and have been carried out periodically ever since.

In the early nineteen-nineties, a researcher at the C.D.C. named Katherine Flegal was reviewing the results of the survey then under way when she came across figures that seemed incredible. According to the first National Health study, which was done in the early nineteen-sixties, 24.3 per cent of American adults were overweight—roughly defined as having a body-mass index greater than twenty-seven. (The metrics are slightly different for men and women; by the study’s definition, a woman who is five feet tall would count as overweight if she was more than a hundred and forty pounds, and a man who is six feet tall if he weighed more than two hundred and four pounds.) By the time of the second survey, conducted in the early nineteen-seventies, the proportion of overweight adults had increased by three-quarters of a per cent, to twenty-five per cent, and, by the third survey, in the late seventies, it had edged up to 25.4 per cent. The results that Flegal found so surprising came from the fourth survey. During the nineteen-eighties, the American gut, instead of expanding very gradually, had ballooned: 33.3 per cent of adults now qualified as overweight. Flegal began asking around at professional meetings. Had other researchers noticed a change in Americans’ waistlines? They had not. This left her feeling even more perplexed. She knew that errors could have sneaked into the data in a variety of ways, so she and her colleagues checked and rechecked the figures. There was no problem that they could identify. Finally, in 1994, they published their findings in the Journal of the American Medical Association. In just ten years, they showed, Americans had collectively gained more than a billion pounds. “If this was about tuberculosis, it would be called an epidemic,” another researcher wrote in an editorial accompanying the report.

During the next decade, Americans kept right on gaining. Men are now on average seventeen pounds heavier than they were in the late seventies, and for women that figure is even higher: nineteen pounds. The proportion of overweight children, age six to eleven, has more than doubled, while the proportion of overweight adolescents, age twelve to nineteen, has more than tripled. (According to the standards of the United States military, forty per cent of young women and twenty-five per cent of young men weigh too much to enlist.) As the average person became heavier, the very heavy became heavier still; more than twelve million Americans now have a body-mass index greater than forty, which, for someone who is five feet nine, entails weighing more than two hundred and seventy pounds. Hospitals have had to buy special wheelchairs and operating tables to accommodate the obese, and revolving doors have had to be widened—the typical door went from about ten feet to about twelve feet across. An Indiana company called Goliath Casket has begun offering triple-wide coffins with reinforced hinges that can hold up to eleven hundred pounds. It has been estimated that Americans’ extra bulk costs the airlines a quarter of a billion dollars’ worth of jet fuel annually.


from the issuecartoon banke-mail thisSuch a broad social development seems to require an explanation on the same scale. Something big must have changed in America to cause so many people to gain so much weight so quickly. But what, exactly, is unclear—a mystery batter-dipped in an enigma.

Though weight-loss books will doubtless always be more popular, what might be called weight-gain books, which attempt to account for our corpulence, are an expanding genre. In “The Evolution of Obesity” (Johns Hopkins; $40), Michael L. Power and Jay Schulkin take a frankly Darwinian approach. They argue that we are fat for the same reason that we are capable of studying our backsides in the mirror. “In many ways we can blame the obesity epidemic on our brains,” they write.

Brains are calorically demanding organs. Our distant ancestors had small ones. Australopithecus afarensis, for example, who lived some three million years ago, had a cranial capacity of about four hundred cubic centimetres, which is roughly the same as a chimpanzee’s. Modern humans have a cranial capacity of about thirteen hundred cubic centimetres. How, as their brains got bigger, did our forebears keep them running? According to what’s known as the Expensive Tissue Hypothesis, early humans compensated for the energy used in their heads by cutting back on the energy used in their guts; as man’s cranium grew, his digestive tract shrank. This forced him to obtain more energy-dense foods than his fellow-primates were subsisting on, which put a premium on adding further brain power. The result of this self-reinforcing process was a strong taste for foods that are high in calories and easy to digest; just as it is natural for gorillas to love leaves, it is natural for people to love funnel cakes.

Although no one really knows what life was like in the Pleistocene, it seems reasonable to assume that early humans lived, as it were, hand to mouth. In good times, they needed to stockpile food for use in hard times, but the only place they had to store it was on themselves. Body fat is energy-rich and at the same time lightweight: when the water is taken out, a gram of fat contains 9.4 kilocalories, compared with 4.3 kilocalories for a gram of protein, and when the water is left in, as it is on the human belly, a gram of fat still contains 9.1 kilocalories, while a gram of protein has just 1.2. As a consequence, a person with a genetic knack for storing fat would have had a competitive advantage. Power and Schulkin are both researchers at the American College of Obstetricians and Gynecologists, and they argue that this advantage would have been especially strong for women. Human infants are unusually portly; among mammals, only hooded seals have a higher percentage of body fat at birth. (Presumably, babies need the extra reserves to fuel their oversized brains.) Tellingly, humans, unlike most other animals, have no set season of fertility. Instead, ovulation is tied to a woman’s fat stores: those who are very thin simply fail to menstruate.
THe New Yorker Analyzes why we are so fat today.

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