No need for the psychoanalysis, Freud. Eating calorie dense food releases pleasure chemicals in our brain, it's that simple. Even the world's happiest skinny person will get a hit of dopamine when the dig into some nachos.

Our brain rewards us when we do things that help our survival, or our gene's survival. Eating, fucking, providing for our family, we're hard wired to derive pleasure from these things. Some people are happy having sex rarely, other people can't help but think about it constantly, some goes for eating food.

Aside from mental illnesses that neither of us are qualified to diagnose, people don't eat too much because of trauma, they eat too much because their brain rewards them for doing so.