A new player in the hunger game has been around longer than humans have had stomachs for them to live in.
The player is the bacteria that live in your gut.

If you cultivate these bacteria with a steady diet of white sugar outside of the body, then suddenly try to change their diet, they excrete hormones.

So what are the purpose of these hormones?

Now if you inject them into a rat's  intestines, you'll find an abrupt feeding behavior change. The rat begins to crave the exact diet of white sugar the bacteria was raised with.

That rat is you.
Gut bacteria nutured with white foods send out signals forcing unatural cravings for those foods when you try to stop eating them.

So then the question is.

What intellegence do I need to deal with this unexpected adversary?