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Diabetes mellitus is a serious condition which comes in three main types – type 1, type 2 and gestational. Find the latest diabetes news and information on symptoms, signs and cure breakthroughs here. Learn what diabetes is, how food and diet can help manage diabetes and blood sugar levels. Type 1 diabetes occurs when the body cannot produce insulin. Type 2 diabetes is diagnosed when the body does not produce enough insulin or the insulin produced does not work properly. Gestational diabetes occurs during pregnancy.