Why are some professional fighters overweight?

Honest question. How do you train for 4-6 hours five times a week and have excess body fat? Are they eating poisonous food. Too much saturated fats and oils, or do they just excess? Raphael Pessoa is morbidly obese and he's a 30 year old professional fighter.

Raphael was the Brazilian HW that opened the card yesterday. 50lbs of excess fat on his body. He was 30lbs lighter a year ago. Everyone posting on here clearly has an 8-pack but feel free to weigh in.