Summary. The triacylglycerol structure of perirenal adipose tissue from rats fed peanut oil.Weanling male rats were fed a balanced diet containing 15 p. 100 peanut oil by weight. The digestibility and fecal excretion of oil fatty acids were studied for 8 days at the beginning of the diet, which was then continued up to 4 months. At the end of the experiment, perirenal adipose tissues were removed and their triacylglycerols isolated and studied. They were fractionated into 8 fractions according to unsaturation and then analyzed by gas-liquid chromatography (GLC) for fatty acids and triacylglycerols. Each fraction was submitted to pancreatic lipolysis ; the mono-and diacylglycerols formed were isolated and their fatty acids analyzed by GLC. The diacylglycerols were further fractionated according to unsaturation and their fatty acid composition analyzed. The triacylglycerol structure of the adipose tissue was determined using mathematical methods previously described.