The invention provides a nutrition supplement which comprises the following components in part by weight: 10-25 parts of wheat grains, 10-25 parts of single-cell protein, 20-50 parts of soluble dietary fiber, 1-15 parts of rhizoma polygonati, 1-15 parts of medlar and 1-5 parts of theanine. The invention further provides a food product prepared by the nutrition supplement, such as a solid beverageand a biscuit. The nutrition supplement and the food product provided by the invention can properly provide nutrition and energy for fasting and dieting crowds who actively restrict the food intake for healthy weight loss, regulate the body nutrition imbalance, improve immune functions, maintain the physical and mental health and maintain the normal physical strength and energy of a human body, sothat people can cope with daily work and life. In addition, the nutrition supplement and the food product can also be taken as emergency food in the case of passive food restrictions caused by natural disasters and the like.