Genetic reason. (the family is the reason that fatso is not heredity certainly, concern likely also with the dietary habit of your home. ) because reduces weight carelessly in one's childhood, cause human body to produce overmuch adipose cell, after adipose cell grows up won't again grow in quantity can increase only, can saying is you laid fat foundation as a child. Eat too much to was not used up. Get the quantity of heat that arrive from the place in food namely, exceed the quantity of heat that use up, and excess quantity of heat turns namely become adipose, accumulate form in adipose cell fat. Reduce metabolicly. The person arrives middleaged hind because metabolic rate reduces easy put on weight; Nutrition not all, eat the meat only kind with rubbish food (nonnutritively food) do not eat fruit vegetable to also can make metabolic rate is reduced easy and get fat.