Abstract
When thiamin was administered to vitamin B1 deficient chicks or rats hydropic degeneration and fatty metamorphosis occurred in the parenchyma of the liver cells. This histologic reaction in the liver was not prevented by choline, lipocaic or by diets high in fat or in casein. Desiccated thyroid was effective in preventing the histologic reactions in the livers. Chemical analyses on these livers showed that there was an increase in total fat, glycogen and moisture. The phospholipid and protein remained unchanged. Thiamin therapy in experimental vitamin B1 deficiency causes an excessive production of free fat in the liver cell which disrupts the normal cell structure.