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Changes in the nature and amounts of tissue lipids are of special significance in elucidating the mechanism by which choline prevents liver-fat deposition. Numerous investigations have been concerned mainly with changes in the relative proportions of the various lipid fractions. Liver-fat accumulation during choline deficiency in the rat is characterized almost exclusively by an increase in glycerides with a proportionate rise in cholesterol content, mostly in the form of cholesteryl esters (Best, Lucas, Patterson & Ridout, 1946). The total phospholipin content of the liver is generally not altered, although a decrease in the proportion of choline-containing phospholipin# has been observed by several authors (Stetten & Grail, 1942; Artom & Fishman, 1943; Fishman & Artom, 1944, 1946; Campbell, Olley & Blewett, 1949). animals. The saturated acids of carcass lipids, like the solid acids of liver glycerides, were influenced by the composition of the dietary fat. There was no apparent relationship between the total fatty acid content of the carcasses and the percentage of lipids in the livers. The present paper deals with the effect of choline on the amount and nature of the fatty acids of the phospholipin and glyceride fractions of liver and carcass of rats maintained on diets free from unsaturated fatty acids. In the light of current views on the function of choline it appeared probable that the exclusion of unsaturated acids would give a clearer indication of the changes taking place in choline deficiency. With the object of studying the effect ofcholine under conditions wherein fat deposition is due on the one hand to assimilation from

Effect of choline deficiency on the fatty acids of liver and body lipids in the rat