The Weight Loss Trap: Why Your Diet Isn't Working

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The concept of the calorie as a unit of energy had been studied and shared in scientific circles throughout Europe for some time, but it wasn’t until World War I that calorie counting became de rigueur in the U.S. Amid global food shortages, the American government needed a way to encourage people to cut back on their food intake, so it issued its first ever “scientific diet” for Americans, which had calorie counting at its core.

In the following decades, when being rail-thin became ever more desirable, nearly all dieting advice stressed meals that were low calorie. There was the grapefruit diet of the 1930s (in which people ate half a grapefruit with every meal out of a belief that the fruit contained fat-burning enzymes) and the cabbage-soup diet of the 1950s (a flatulence-inducing plan in which people ate cabbage soup every day for a week alongside low-calorie meals).

The 1960s saw the beginning of the massive commercialization of dieting in the U.S. That’s when a New York housewife named Jean Nidetch began hosting friends at her home to talk about their issues with weight and dieting. Nidetch was a self-proclaimed cookie lover who had struggled for years to slim down. Her weekly meetings helped her so much–she lost 72 lb. in about a year–that she ultimately turned those living-room gatherings into a company called Weight Watchers. When it went public in 1968, she and her co-founders became millionaires overnight. Nearly half a century later, Weight Watchers remains one of the most commercially successful diet companies in the world, with 3.6 million active users and $1.2 billion in revenue in 2016.

What most of these diets had in common was an idea that is still popular today: eat fewer calories and you will lose weight. Even the low-fat craze that kicked off in the late 1970s–which was based on the intuitively appealing but incorrect notion that eating fat will make you fat–depended on the calorie-counting model of weight loss. (Since fatty foods are more calorie-dense than, say, plants, logic suggests that if you eat less of them, you will consume fewer calories overall, and then you’ll lose weight.)

That’s not what happened when people went low fat, though. The diet trend coincided with weight gain. In 1990, adults with obesity made up less than 15% of the U.S. population. By 2010, most states were reporting obesity in 25% or more of their populations. Today that has swelled to 40% of the adult population. For kids and teens, it’s 17%.

Research like Hall’s is beginning to explain why. As demoralizing as his initial findings were, they weren’t altogether surprising: more than 80% of people with obesity who lose weight gain it back. That’s because when you lose weight, your resting metabolism (how much energy your body uses when at rest) slows down–possibly an evolutionary holdover from the days when food scarcity was common.

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