I am not sure I understand this when referring to Russian Roulette are you referring to a gun with a single bullet place against your head or just walking blindly into traffic.
Also if you are saying it is prohibited to overeat, when does the prohibition take effect at the first bite or after he is full. If it’s at the first bite is he suppose to starve, a starvation diet is not healthy. People die of starvation. If it’s when he is full how do witnesses know when he is full, if he himself doesn’t realize it. Maybe his weight problem is caused by a chemical imbalance.