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While certain diets or foods may not ease depression (or put you instantly in a better mood), they may help as part of an overall treatment plan. There's more and more research indicating that, in some ways, diet may influence mood. We don't have the whole story yet, but there are some interesting clues.
But this research is still in early stages, so we don't know unequivocally if unhealthy foods actually cause illnesses such as depression. What's not clear is whether your diet affects your mental health or if it's your mental health that affects your food choices.