It is an edible tuber, hard-skinned and colored brown to pinkish gray. Its texture can vary from smooth and moist to rough, dry and mealy. The interior is of white in color and rich in starch. Yam is a food rich in carbohydrates, proteins and a quantity
appreciable vitamin C and vitamin B1. Provides a substantial part of the manganese needs and phosphorus in adults and, to a lesser extent, also copper and magnesium