Unsurprising, given that sexual orientation and race are not the result of choices. There is no decision to be made, no change in input will change the output.

Dietary habits are entirely active choices, it's an active decision making process, and weight is the outcome of those inputs. Gaining or losing weight is basic physics.

Perhaps obesity and food abuse/addiction should be looked at much the same way that drug abuse/addiction is looked at. Obesity is the natural outcome of food abuse.