From the article: "Although our high-calorie, sedentary lifestyle contributes to the approximately 10-pound average weight gain of Americans compared to the re

From the article: "Although our high-calorie, sedentary lifestyle contributes to the approximately 10-pound average weight gain of Americans compared to the recent past, some people are more severely affected by this lifestyle than others. That's because they have inherited genes that increase their predisposition for accumulating body fat. Our modern lifestyle is thus a necessary, but not a sufficient, condition for the high prevalence of obesity in our population." Which basically gives you the answer to your comment. You've read the article, haven't you?