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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.
The more you decrease your carb intake, the greater the short-term side effects. You'll be less affected by a moderately low-carb diet that contains 100 to 150 grams of carbohydrates daily than by a very-low carb diet that contains 50 grams of carbs or fewer per day. If you have any particularly bothersome side effects, consult your doctor.