 They all have odour activity value more than 50, but the aroma of these substances in an isolated state does not resemble buckwheat.With a 100-gram serving of dry buckwheat providing of food energy, or cooked, buckwheat is a rich source (20% or more of the Daily Value, DV) of protein, dietary fiber, four B vitamins and several dietary minerals, with content especially high (47 to 65% DV) in niacin, magnesium, manganese and phosphorus (table).Buckwheat is 72% carbohydrates, including 10% dietary fiber, 3% fat and 13% protein.