This is an excellent article.

The hormonal model of obesity fits into this paper very well. Basically the hormonal model says the addiction is not to food, it's to carbohydrates and sugar. Carbohydrates and sugar increase blood sugar levels, which increase insulin levels. Which puts the body into dysfunction. It doesn't matter how much food you're eating, it matters how much insulin your body is producing. Insulin is a massive superstar hormone that affects the entire body.

So a lot of the addiction and withdrawal people are talking about is sugar withdrawal, blood sugar dropping, and the body having to adapt to a new energy source. I. E. Fat burning / ketosis.

https://www.youtube.com/watch?v=JlprNSkEcdo