The worldwide epidemic of type 2 diabetes and impaired glucose tolerance is a crucial health problem. Since disorder of carbohydrate metabolism causes arteriosclerosis in combination with other metabolic abnormalities such as hypertension, hyperlipidemia and obesity, it has now been recognized as one manifestation of the metabolic syndrome, a condition characterized by insulin resistance. In this article, we summarize the current our knowledge on how disorder of carbohydrate metabolism influences insulin resistance and arteriosclerosis in part of metabolic syndrome.