How would that be the result of a medicial condition? If he was still hungry after eating 20 Big Macs for example, perhaps he had enough regardless of the sensation in his stomach? If he thinks otherwise he is an idiot. Does he look in the mirror and see a slender young man? The only excuse for that is eating an above average diet but gaining stupid amounts of weight from it. He is a greedy, disgusting waste of space IMO.
All documentries I have watched about obese people seemed to conclude with the overweight person not regretting their life-style choice (Some seem quite proud) just the consequences that arised from their choice.
No sympathy quite frankly.