They are also physically weaker, while they have mass, that mass is made of fat and not muscle. Lack of use of the muscles weakens them, perhaps to the point of atrophy (I am not sure). This will affect surgery/injury/illness recovery times, their chances of being able to defend themselves well (big beasts are easy targets for muggers!) and they may be the direct reason that they and other people die in emergency situations, for example; a 400lb fat fuck sat illegally in an aircraft emergency exit row could block the exit and not have the strength to open the door, even if not in an exit row, a fat fuck trapped in its seat by its mass could cause the death of the window and middle seat passengers, hell, if there was a fire on the plane and there was an emergency evacuation, there is no way that a fatty can move as quick as human sized people and could cause deaths by slowly lumbering down the aisle while the people behind it suffocate from the smoke and toxic fumes.  For those reasons, I will not ever sit by anyone huge on a plane, I would genuinely fear for my safety and that of my Fiance, or anyone else I am flying with.