The effectiveness and safety of the conventional diabetes treatment is negative in RCT and RCT meta analysis having high reliability. In other words, take carbohydrate commonly and aiming at blood sugar control by medical treatment strictly, the profit is very few and is degree offset by a hypoglycemia risk. After take carbohydrate, always occurs postprandial hyperglycemia and glucose swing, as a results oxidative stress occurs, and it is with the risk of complications. The hypoglycemia risk occurs if doctor give strict medical treatment. They do notproduce with carbohydrate restriction diet. It was said that American DiabetesAssociation(ADA)did not recommend a carbohydrate restriction diet until 2007, but accepted it in“Nutrition Therapy Recommendations for the Management of Adults With Diabetes”formally in October, 2013. The brain cardiovascular event outbreak has nothing to do with a saturated fatty acid intake.“There is no risk of the coronary disease in a low carbohydrate high-fat high-protein meal”and “There is no cardiovascular disease risk improvement effect to low lipid food” articles having high reliability of these three conclusions is reported. The long-term safety of the carbohydrate restriction diet maintained the same and was secured. Furthermore, by carbohydrate restriction diet practice, blood sugar level, HbA1c, acylglycerol level, HDL cholesterol level are improved. The LDL cholesterol level often becomes the standard value in the long term, too. In other words, because all the arteriosclerotic risk factors are improved, and so the long-term prognosis of the carbohydrate restriction diet is very likely good.