Serum lipid profiles of 76 men of young age (17-21years) were investigated using thin layer chromatography and determination of somatotypes was realized using the scheme of V.P. Chtetsov et al. (1978). The investigation was conducted on an empty stomach and after one hour after food loads (test meal with energy value of 419 kcal, content of proteins - 17,9 g, fats - 11,9 g, carbohydrates - 60,1 g). Regularities inherent to certain somatotypes were revealed. In young men with the abdominal somatotype (with the most pronounced fat component), changes evidencing membranes rigidity growth were revealed: cholesterol esterification processes inhibition and increase of sphingomyelin after meal (p = 0.001). In young men with muscular somatotype the highest level of phosphatidylcholine and the lowest level of easily-oxidized phospholipid fractions in comparison to other somatotypes [thoracic (p = 0.044), abdominal (p = 0.037) and undetermined (p = 0.021)] were registered. General rule is lowering of the free fatty acids levels after meal in comparison with the indices on the empty stomach for all somatotypes: thoracic (p = 0.0001), muscular (p = 0.012), abdominal (p = 0.041) and undetermined (p = 000018). Definiteness of the effect of lowering of free fatty acids levels after meal for all somatotypes could evidence the importance Of this process for maintaining the homeostatic body constants.