[MrTortoise]

The problem is do you consider the minds reactions to hormones mental or nutritional? You can have plenty of 'willpower' but if your chemistry craves balance then you have blurred boundaries into saying its both, neither and that they are broken abstractions.

[ThrustVectoring]

"Willpower" isn't the answer, either. Like, long-term expenditure of willpower isn't a good solution to any problem. I hope I didn't imply that that was my proposed solution.

Like, what I'm saying is that if you replaced the decision-making process for eating with an algorithm designed to bring someone to a specific body weight, that would basically solve the obesity problem.

To answer your question more directly, there may be nutritional solutions to the mental problems that lead to over-eating.