Nutritional problems of the aged.
D000368:Aged; D000375:Aging; D002648:Child; D004032:Diet; D004068:Digestive System Physiological Phenomena; D006801:Humans; D007421:Intestine, Small / Q000378:metabolism; D008875:Middle Aged; D009055:Mouth / Q000502:physiology; D009748:Nutrition Disorders / Q000209:etiology; D009747:Nutritional Physiological Phenomena; D013649:Taste / Q000502:physiology