Eh, in a clinical setting only eating "good food" works fine.

In the real world this is not what people experience. Especially those that experience mental food noise.

Imagine there is a donut in a box at work. It's free, you can have it at any point. It's junk food, it's bad for you, it's not part of your diet and you don't want it. I mean you ate a high fiber food and protein earlier, you shouldn't be hungry at all. Now imagine there's an additional voice in your head that just slips in "Ok, finish that page your on and go pick up that donut". How long can you resist it? You probably won't even notice it since it's the normal stream of thought you have. At some point you'll end up with that donut in your hand.

Now take a GLP-1. The voice gets silenced. If you smoke or drink you'll notice that you don't really want to do that either.