Show effect on digestion and nerves laboratory experiments have also indicated that when there is a shortage of vitamin G digestion is is usually impaired in this respect a shortage of vitamin G has a slightly different effect than a deficiency of vitamin B A definite lack of vitamin B causes an abrupt and complete loss of appetite withholding vitamin G appears to affect the desire for food so that experimental animals consume only about two thirds as much as they would normally take A form of nervous depression may occur when the diet is low in vitamin G for any protracted length of time other unfortunate consequences may be a decline in the health of the skin studies with animals indicated that when the vitamin was withheld not only did a loss of weight occur but there were other signs of nutritional failure these included an inflammation of the mouth a loss of hair a thickening and in some cases a cracking and sealing scaling of the skin |