Hi!
Ok, I am not an expert, but as far as I know food plays a huge part when it comes to mood.
A lot of foods have influences of your brain chemistry, they evoke (donīt kow if the word is right...canīt find dictionary...) serotonin for example. Most diets cut down the food with the hugest impact on your brain chemistry: sugar.
No sugar- low serotonin and other things I forgot- depression.
Itīs quite the same for me...I am an emotional eater/ overeater as well, thatīs why I work on that issue and lose veeeery slowly. Diet plans donīt work for me

I read several books from Kathleen DesMaisons. She explains very good what happens when you eat a certain food, how it influences your moods etc.
The good thing is: there is a way out of the vicious circle!
Oh, well, I hope you understand what I wanted to say!

Kate