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Old Economy Steve graduates and gets a job right away. And so forth. The authors examined the dietary data of 36, Americans from to and the physical-activity data of 14, people from to They grouped the data sets together by the amount of food and activity, age, and BMI. They found a very surprising correlation: A given person, ineating the same amount of calories, taking in the same quantities of macronutrients like protein and fat, and exercising the same amount as a person of the same age did in would have a BMI that was about 2.
In other words, people today are about 10 percent heavier than people were in the s, even if they follow the exact same diet and exercise plans. Just what those other changes might be, though, Older slender women still a matter of hypothesis. In an interview, Kuk proffered three different factors that might be making harder for adults today to stay thin. First, people are exposed to more chemicals that might be weight-gain inducing.
Pesticides, flame retardants, and the substances in food packaging might all be altering our hormonal processes and tweaking the way our bodies put on and maintain weight. Prozac, the first blockbuster SSRI, came out in Antidepressants are now one of the most commonly prescribed drugs in the U. Finally, Kuk and the other study authors think that the microbiomes of Americans might have somehow changed between the s and now. Americans are eating more meat than they were a few decades ago, and many animal products are treated with hormones and antibiotics in order to promote growth.
All that meat might be changing gut bacteria in ways that are subtle, at first, but add up over time.
Kuk believes that the proliferation of artificial sweeteners could also be playing a role. The fact that the body weight of Americans today is influenced by factors beyond their control is aKuk says, that society should be kinder to people of all body types.
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Aging changes in body shape