People aren't born fat, these days the food habits were the one that makes people become fat. Sedentary lifestyle, less physical activities, more dependence on machinery lives, overeating, more intake of oily food. In simple terms imbalanced diet is the major reason for people getting fat.
Detailed information about people getting fat is really good to know. User who are fat could avoid these and can get good results. Being fat isn't a big problem, people easily gets depressed on being fat which too makes people go fatter and fatter even when they try to follow diets.