Scientists studied dietary data from 36,400 Americans between 1971 and 2000 as well as data relating to the exercise and activities of 14,419 Americans between 1988 and 2006. They compared these data to body mass index (BMI Body Mass Index, in French).

The conclusion is surprising: even following the same regime as much or doing sports, adults in recent decades have become cumbersome. “We found that people who follow the same diet weighed 10% more in 2008 than in 1971 and 5% more by doing the same amount of physical activity,” says the lead author of the study Ruth Brown York University in Toronto.

Several factors

According to the researchers, the results suggest that if you have forty years now and want to stay slim, you have to eat less and practice more sports than if you had forty years ago a few decades.

The results also reveal that in addition to diet and exercise, there are other specific changes that contribute to the obesity epidemic. For the authors, it still focuses too much on the amount of energy ingested and expended by the body and we take too little account of lifestyle, pollution, genetics and timing of meals, but also bacteria and even exposure to light at night. (IPS / LP)