Chocolate is definitely something that a lot of people eat when they are stressed/upset/depressed – but they usually eat it to feel better!
People respond to stress and being upset differently – about half of people lose their appetite and don’t feel like eating at all, while the other half crave ‘comfort foods’ like chocolate, cakes and ice-cream.
There is actually a biological reason for this, because chocolate (and other sugary foods) can activate a special region of the brain called the reward centre, which causes a chemical called dopamine to be released into this part of the brain and creates a feeling of pleasure. The effect doesn’t last for that long, so people who use chocolate (or other foods) to feel better, can end up becoming dependent on these foods to feel good (a kind of addiction). But, in moderation, there is no reason why chocolate should make you feel depressed