Commonly known as white yam, Dioscorea. Entangled network herbaceous Fujimoto, plants are growing medium, stems round, purple, sometimes with green stripes, right-handed, 3 to 5 meters long; branch less. Single leaf, stem, lower leaves are alternate, in upper leaves opposite, rarely whorled; blade length of 6.0 cm (4.1 to 8.0), 6.2 cm wide (3.5 to 9.0), petiole length of 5.4 cm (3.2 to 8.5); both sides smooth no pubescence, surface dark green, the back white; the margin entire, or sinuolate edge; base deep heart-shaped, wide heart-shaped tubers long cylindrical, 90 to 120 cm long, 3 to 5 cm in diameter, plant weight from 1000 to 1900 grams, longer shoots, 10-20 cm long; cross-section of pure white, dense, good quality; epidermis brown, dense fibrous roots, the tumor is large and dense, delicate taste and high nutritional value, pure green, pollution-free, since ancient times yam yam, mountain medicine "argument. White health value of white yam yam as a health food in China for at least 2,000 years of history, "Shen Nong's Herbal Classic" was published in the Eastern Han Dynasty more yam as a top grade. Spleen and stomach, lower blood pressure and blood sugar, resist tumor, anti-aging effects, Vegetables beneficial to health. The white yam nutritional value is extremely rich, laboratory analysis, the hectogram contains carbohydrates 19.9 - 21.5 g, protein 1.9 - 2.25 g, iron, zinc, copper, manganese content is also high, in addition to rich containing the human adrenal required mesothelin, mucilage, choline, protein, starch, sugar, free amino acids, ended pitchfork hormone, vitamin C, amylase, diosgenin, white yam mucus juice, choline, protein-rich , polyphenol oxidase, mannose polysaccharide, phytic acid, 16 kinds of amino acids, allantoin and 3,4 - dihydroxy-phenylethylamine, etc. These are important nourishing ingredients, can be described as nutrition is extremely rich. The white yam for women, is a natural slimming food. It contains enough fiber, will produce a sense of fullness after eating, so as to control the desire to eat. Secondly, the yam itself is a highly nutritious, low-calorie food can safely eat more to worry about and not have to get fat. And because it's low in calories, sucrose-free features, has become an ideal food for people with diabetes.