What I find interesting is that a lot of "smallfats" don't seem to eat very large quantities, or spend a lot of time eating. They just eat very fast (10 minutes max. for any meal), often (lots of snacks), and their food is calorie-dense while also being easily digested or not requiring a lot of chewing (simple carbs - sugar, chips, white bread; also butter, oil, and cheese on everything). They also probably get a lot of calories from alcohol/soda/juice/sweetened coffee. Take that, and combine it with gluttony (someone who does eat large quantities), and you get a megafat.