Diet religion. Ever seen a fat muslim? Islam might not be wildly known for its contribution to human progress, but neither progressive eating. -It`s the worst markets, says Head of Obesity at McDonalds. They will not gain weight. We practically loose money there. We lay off 99% of our staff during Ramadan. If it hadn`t been for the muslims who sneak out at night to get a burger we would be out of business.