The mood-enhancing properties of chocolate are well known in both the Muggle and wizard worlds. Chocolate is the perfect antidote for anyone who has been overcome in the presence of Dementors, which suck hope and happiness out of their surroundings.
Chocolate can only be a short-term remedy, however. Finding ways to fight off Dementors – or depression – are essential if one is to become permanently happier. Excessive chocolate consumption cannot benefit either Muggle or wizard.
- Pottermore, Prisoner of Azkaban Chapter 12