There are multiple lipids anomalies on diabetes. IDDM has, because of insulin lack, raised levels of triglycerides and afferent lipoproteins. NIDDM, especially the obese one, directly linked with insulin-resistance and hyperinsulinemia, has different and complex anomalies. There is a specific type named "B phenotype" with high cardiovascular risk: raised LDL chol charged with TG and low level of HDL chol. Our study on 58 cases with NIDDM obese concluded that only 28% had high TG levels but 71.8% had low levels of HDL chol. We administered fibrates, therapeutical doses, 3 months. We made lipidograms from the beginning and after one and three months. So we proved the good effect of fibrates on lipids: rise of HDL chol., moderate effect on LDL chol. for reduced cardio-vascular risk. There were good results on glucose tolerability (improving 65.8%, p < 0.01).