THE TRANSPORTATION OF ABSORBED LIPIDS

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Abstract
In 3 dogs the % of absorbed lipids which was transported by the left thoracic duct lymph during and immediately after absorption of lipids varied from 4-17%. The rate of transportation of total lipids, neutral fat and phosphatides increased during absorption. There is a greater increase in the proportion of cholesterol in the free state in the general circulation during the absorption of lipids than during the absorption of non-lipids. There is a definite increase in the neutral fat conc. in the general circulation during the absorption of lipids and little change during the absorption of non-lipid material. There is little change in the conc. of phosphatide in the general circulation during the absorption of lipids, but there is a marked decrease during the absorption of non-lipids. These results are evidence that neutral fat and phosphatide enter the general circulation during lipid absorption, probably by way of lymphatic-venous communications. There is no evidence that absorbed lipid enters the portal blood directly. The increase in portal plasma lipids, during non-lipid, as well as lipid absorption, suggests a mobilization of stored lipids by the portal blood under the stimulus of absorption itself.

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