What an idea. This guy goes on an all Mcdonald’s diet for a whole month. He doesn’t gain as much weight as I did (33% of my total body weight) but at least he gets very sick. The doctor reccommends he quit the diet after 15 days.
He ate more Mcdonald’s than nutritionists say you’re supposed to eat in 8 years. 
He also did another documentary where he and his wife lived for 30 days on minimum wage. His wife was bringing home crackers from work for nourishment.