It's not just the exercise, or the "poor diet". It is the quantity of food and the type of food it is. Notoriously, "comfort" food is universal--fried chicken, mashed potatoes, gravy, warm bread, chocolate cake, fruit pie, and a sweet drink. Nothing particularly racial about those foods--or the way they sit on white as well as black hips.
So, do the hair--but first walk over to the beauty parlor and plan on a salad for dinner.