oil emulsion and ostrich egg yolk blood was drawn from the caudal vein of the rats immediately prior to corn oil administration 0 min and 120 minutes after administration 120 min without anesthesia neutral fat content in plasma was measured by using triglyceride e test kit from wako pure chemical the values in the graph indicate the mean value of 6 rats in each group the results are shown in fig3 the horizontal axis indicates different types of ostrich egg yolk dosages mg for immediately before administration of corn oil 0 min and 120 min the control is the case where the ostrich egg yolk amount is 0 mg further the vertical axis indicates the blood triglyceride level mg dl in the control group the blood triglyceride level increased about 5 fold at 120 minutes after intake of corn oil in the ostrich egg yolk administered groups however increase in blood triglyceride level after corn oil intake was significantly suppressed in an egg yolk amount dependent manner a dramatic suppression effect was found even with a low dose 10 mg intake of egg yolk obtained from ostriches after lipase immunization resulted in lipase activity inhibition and suppression of digestion decomposition of fats into triglyceride thus it is concluded that absorption from the intestinal tract is suppressed resulting in suppression of increase in blood triglyceride levels in this manner intake of egg yolk itself can also inhibit the activity of a digestive enzyme in the present invention lt effect of heat treated ostrich egg yolk containing anti lipase antibodies on variation in neutral fat in rat plasma after loading corn oil gt.