Some diets may create bad moods

November 9, 2009 When people who want to lose weight are successful , their spirits are almost always lifted. But what about the long term effects?

Researchers compared the results of participants on low-fat and low-carb diets over the course of a year. Both lost the same amount of weight and both experienced a boost in positive mood the first few weeks of dieting.

But the good mood didn't last long for those on the low-carb diet. The study in the Archives of Internal Medicine suggests one reason is low-carb diets are less flexible and tend a be socially difficult to keep up. Also, carbohydrates have been linked with the production of positive mood chemicals in the brain. It's possible the lack of carbohydrates themselves affect mood.

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