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The study published in the Archives of Internal Medicine finds people on traditional low-fat, low-calorie diets generally stayed positive throughout the length of their diet.
But the moods of people on a low-carb diet started to turn sour after about eight weeks. That's because a lack of carbohydrates affects mood chemicals in the brain.
Also, people on low-carb diets have less flexibility in what they're supposed to eat, so there's more social stress in sticking with it.
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