Researchers found that people on high-fat, low-carb diets are more irritable than dieters who choose a low-fat, higher-carb regimen. The study of 106 Australians found that the diets were both effective, but "some aspects of the low-carbohydrate diet may have had detrimental effects on mood that, over the term of one year, negated any positive effects of weight loss," scientists said.

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