Nineteen non-insulin dependent diabetes mellitus (NIDDM) patients with obesity were divided into two groups, and a group of eight patients who could try exercise was treated with walking over 160 Calories per day, and a group of eleven patients who could not try exercise was treated with Boui-ougi-to, for six months. Although exercise is known as the treatment of visceral fat obesity, no significant improvement was observed in body mass index, visceral fat/ somatic fat (V/S) ratio, blood sugar, serum cholesterol level in the patient group with exercise, whereas in the patient group treated with Boui-ougi-to, serum cholesterol significantly decreased from 197±31mg/dl to 180±19mg/dl (p<0.01), and V/S ratio improved significantly from 0.84±0.56 to 0.64±0.30 (p<0.05). These observations suggest that treatment with Boui-ougi-to is effective for visceral fat obesity and has potential for the prevention of atherosclerosis.