This study was done to see effects of feeding a 77% polished or brown rice diet with corn oil, rice bran oil or butter on the lipid metabolism in weanling rats. The results are summarized as follows : 1) Food consumptions, body weight gains and tissue weights were not different among experimental groups. 2) Weights of daily fecal output and daily fecal excretions of total lipids, cholesterols, nitrogen and glucose were higher in brown rice groups than in polished rice groups. 3) Polished rice - rice bran oil group had the highest concentrations of total lipids and cholesterols in serum 4) Polished rice groups tended to have higher serum lipid and cholesterol concentrations than brown rice groups.