My SIL is a BIG man. Even he got to only 400 lbs and all the sickness that goes with it, heart, diabetes, etc before he chose Bariatric surgery. He’s lost 200 lbs and now weighs where he should for his size.
Only ENABLERS get a person to be 800 lbs and no will power.
No sympathy from me. Learn to eat less, it’s how others control their weight. Ditto goes for the Booze addicted which includes my only brother. He sends a cab to pick it up for him as he is now a invalid.