ViolentPanda
Hardly getting over it.
Sorry to hear about your cousin.
Basic science says that to survive any warm blooded creature needs :-
Shelter / warmth
Water
Air
Food
There are no calories in shelter unless you are eating the furniture in which case you have more severe health problems to worry about that being overweight.
There are no calories in water and I do mean water not bottles of fizzy pop.
There are no calories in air unless you work in or live down wind of somewhere that utilizes powdered sugar by the ton.
There are calories in food.
Here's some more basic science for you.
The human body is not a closed system that cannot be influenced or infiltrated by external factors. Because of this it's perfectly feasible (and well-known in actual scientific research literature) that medications (which are, after all, "alien" to the human body) can influence the various competences of that body.
All your talk of sugar is meaningless in the face of that.
I'll take your word that he wasn't cheating so that leaves the hospital were over feeding him. Some may be down to water retention but you can get medication to control that if the hospital had bothered.
Nope. You can get medication to deal with some forms of fluid retention. They're called diuretics, and I've been taking one for 15 years. In tissue where the bulking effect has regularised, it's far harder to find medications to use to help fluid expulsion.
As for the hospital over-feeding him, they calorie-controlled him for 18 months. It was impossible for him to be overfed.
Just because reality doesn't fit to your frankly scientifically-naive vision of weight retention, doesn't mean reality is incorrect. Use Occam's Razor and it's you who are incorrect, whichever way you slice it.
At 70Kgs your cousin would only be obese (as this is what this thread is about) if he was under 5 ft tall. http://www.nhs.uk/Livewell/healthy-living/Pages/height-weight-chart.aspx
And yet again you completely miss the point.