The Secret Life of Fat- Body fat is an organ that has an essential role in our health- There are different kinds of body fats, and they function differently in the body.- Too little body fat increases risk of disease, lowers life expectancy, as does obesity. - Body fat fights hormonally against efforts to get rid of it.- Once overweight or obese, it is permanently more difficult to return to and maintain a healthy amount of body fat.- Viruses can lead to changes in body fat production.