Answers:
It can never be able-bodied to be 180kg(nearly 400 pounds.) There are lots possibilities to why he could enjoy gain a large amount of solidity besides the certainty that he doesn't wight train anymore. He could enjoy a own flesh and blood history of overweight relatives. His age, recent diet, amount of physical amusement or sickness could also incentive it. So it would be best for him if he changed to a fit impartial diet and start exercising a bit. Of course the Number 1 item that he desires to do is to see a doctor. Myself or anyone else here can't make clear to the true form of an individual and impart informed suggestion unless they are a medically trained professional who have examined said individual.
I'm not familiarized beside metric counterbalance, but it would depend on his increase. I freshly looked up the conversion factor; if 180kg = 81.5 lbs, I'd utter that's remarkably restrained for an fully developed mannish. I would enjoy expected him to gain shipment after quitting exercise. Maybe he have an drinking disorder. Can you bring him to have a word to a counselor or his doctor?