Diets centered on restricting carbohydrates have been touted for decades as a , but it turns out not all low-carb diets are slimming - and some could even lead to weight gain.Researchers from Harvard studied more than 123,300 people from three different health databases.The participants ate one of five types of low-carb diets, and their and body mass index (BMI) were tracked every four years over 20 years.
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