, food, alcohol, nicotine, enter the body and ultimately degrade to the same neurochemistry that is common to all pleasure, and all addiction.
On the neurochemical level, you are
eating so that
the food will work like an antidepressant or like a drug or alcohol. If you eat too much food, you will get a 'high' and feel better, but then you will also experience the crash afterwards. This is when the cravings start and then you 'eat bad' in an attempt to feel better.