health is simply the absence of disease, and obesity now being considered a disease, is entirely preventable, regardless of people who blame their "glands," which i say itself is 99% bullshit. much of it is caused by too much ass-sitting after consuming ungodly amounts of fat, cholesterol & sugar. however, those ingredients do not contribute so much as the aforementioned ass-sitting afterwards. so eat all the jelly doughnuts, burgers, fries, milkshakes or what have you as long as you can effectively burn them off.