designated eater
A person who voluntarily eats food that other people do not want to eat or can not eat due to diets or health issues, thus allowing those people to enjoy the benefits of their diets.
With nearly everyone in the office on either low-carb or low-fat diets, I have become the designated eater at company parties, enjoying the plethora of cakes, cookies, pies, and assorted junk food.
A hobbit makes a good designated eater, as does a computer programmer.
A hobbit makes a good designated eater, as does a computer programmer.