Scientists followed 50 men and boys ages 15 to 25, all of them with acne, for 12 weeks. Some subjects stuck to a typical diet high-glycemic index foods like white bread, sweetened cereals and pasta, and the others were given foods higher in protein and lower GI, like fish, whole-grain breads and fruit. At the end of the study, published in 2007, the subjects on the low-GI diet had far greater reductions in skin lesions and other symptoms of acne.

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