Biochemical studies such as growth rate, blood cholesterol and ascorbic acid contents in various organs of albino male rats were studied both in the instant food (Ramyon) and rice diet fed groups. The conclusion was as the followings: 1) Either single ramyon or rice fed rats were not shown growth rate properly. In supplementation of 10% or 20% protein on ramyon, growth rate was a little increased than that of the rice diet group. 2) No essential difference of vitamin C contents in various organs was observed between ramyon and rice diet fed rats. Serum vitamin C level of the rice diet group was shown higher than that of the ramyon group. 3) Blood cholesterol level of ramyon fed rats was higher than that of the rice diet group, whether single or protein supplemented diet was fed. 4) Liver lipid contents showed higher in the rice diet group than in the instant ramyon group.