disorders of nutrition
Niacin Deficiency
Introduction
 deficiency also have deficiencies of Undernutrition , A distinctive dark red rash appears on the hands, feet, calves, neck, and face, and the tongue and mouth turn dark red. People have digestive tract problems, fatigue, insomnia, apathy, and later confusion and memory loss. The diagnosis is based on the diet history, symptoms, and sometimes urine tests. High doses of nicotinamide or nicotinic acid, taken by mouth, can correct the deficiency. , a B Overview of Vitamins , is essential for the processing (metabolism) of carbohydrates, fats, and many other substances in the body and for the normal functioning of cells. Good sources ofniacininclude dried yeast, liver, red meat, poultry, fish, legumes, and whole-grain or enriched cereal products and bread. Foods rich intryptophan(an amino acid), such as dairy products, can compensate for not consuming enoughniacinin the diet because the body can converttryptophantoniacin. The term "niacin" is used in two ways: as a synonym fornicotinic acidand as a broader term that includes nicotinamide andnicotinic acid, two forms of this B vitamin. 