You can add it. If you add it, the balls will be slightly fluffy and soft. Yam glutinous rice balls. The spleen and stomach are the source of qi and blood biochemistry and govern the transportation and transformation. Only by nourishing the spleen and stomach can we absorb the nutrients of food and promote the movement of qi and blood; but the spleen is afraid of Dampness and stomach are afraid of cold. To nourish the spleen and stomach in winter, you need to stay away from cold dampness, drink more hot soups, and often eat white ingredients. In terms of diet, yam is a particularly recommended ingredient.