These are another feature distinguishing people who indulge heavily in animal protein foods. The arteries are not the only tissues that are forced to accept fat and cholesterol in excess of the body's capacity to excrete. In high concentrations cholesterol precipitates into crystals, and an indication of an enthusiastic meat-eater is the whitish ring around the iris of the eye consisting of cholesterol crystals (arcus senilus). It is of such crystals that

gallstones are principally composed in the gallbladder, but again, like kidney stones, once the condition of toxemia is removed the gallstones gradually dissolve and disappear.