Inhabiting a Large Body

So what is it that allows people to get excessively large? To essentially play Russian roulette with their health, and yes, their lives? And please don’t give me: “Oh…it’s hereditary… hereditary my butt!!” I am no expert on this topic by any stretch of the imagination, however, I would venture to say that unless you are a goner, or clinically and hopelessly depressed, or just don’t give a hoot about your health and your appearance…