Courtesy of Rick Hall, About.com Nutrition Guide
nutrition.about.com
Yam is the common name for some species in the genus Dioscorea (family Dioscoreaceae). These are perennial herbaceous vines cultivated for the consumption of their starchy tubers in Africa, Asia, Latin America and Oceania. There are hundreds of cultivars among the cultivated species. Yams are not sweet potatoes, but are used in a fashion similar to potatoes and sweet potatoes. The word yam comes from Portuguese inhame or Spanish ņame, which both ultimately derive from the Wolof word nyam, meaning "to sample" or "taste", in other African languages it can also mean "to eat" e.g. yamyam and nyama in Hausa. Yam tubers can grow up to 2.5 meters in length and weigh up to 70 kg (150 pounds). The vegetable has a rough skin which is difficult to peel, but which softens after heating. The skins vary in color from dark brown to light pink.
Note: If there is a range given below for a particular nutrient, this difference is due to the nutrient quantity given from more than one nutritional resource. This is a general guideline only and actual nutrient content in any given food item may vary slightly depending on soil conditions, type of fertilizer used, storage conditions, freshness of the product, and genetic variety of the food item.
NUTRIENT UNITS 1 cup, cubes
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150.000 gProximates Water g Energy kcal Energy kj Protein g Total Lipid (Fat) g Carbohydrate, By Difference g Fiber, Total Dietary g Ash g Minerals Calcium, Ca mg Copper, Cu mg Iron, Fe mg Magnesium, Mg mg Manganese, Mn mg Phosphorus, P mg Potassium, K mg Selenium, Se mcg Sodium, Na mg Zinc, Zn mg Copper, Cu mg Manganese, Mn mg Selenium, Se mcg Vitamins Vitamin C, Ascorbic Acid mg Thiamin (Vitamin B-1) mg Riboflavin (Vitamin B-2) mg Niacin (Vitamin B-3) mg Pantothenic Acid (Vitamin B-5) mg Vitamin B-6 (Pyradoxine) mg Folate / Folic Acid (Vitamin B-9) mcg Vitamin B-12 (Cobalamin) mcg Vitamin A, IU IU Vitamin A, RE mcg_RE Vitamin E mg_ATE Vitamin E IU Lipids Total Lipid g Total Fatty acids, Saturated g 4:0 g 6:0 g 8:0 g 10:0 g 12:0 g 14:0 g 16:0 g 18:0 g Total Fatty acids, Monounsaturated g 16:1 g 18:1 g 20:1 g 22:1 g Total Fatty acids, Polyunsaturated g 18:2 g 18:3 g 18:4 g 20:4 g 20:5 g 22:5 g 22:6 g Cholesterol mg Phytosterols mg Amino Acids Tryptophan g Threonine g Isoleucine g Leucine g Lysine / Lycine g Methionine g Cystine g Phenylalanine g Tyrosine g Valine g Arginine g Histidine g Alanine g Aspartic Acid g Glutamic Acid g Glycine g Proline g Serine g
USDA Nutrient Database for Standard Reference, Release 12 (March 1998)
Nutrition Almanac, 5th Edition, 2002 By Lavon J. Dunne
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