The staple food includes grains such as rice, wheat and corn, as well as tuber foods such as potatoes and sweet potatoes. Common staple foods are rice, flour (such as noodles and jiaozi), corn and millet.

In addition, staple food refers to the main food on the dining table, which is the main source of protein, starch, oil, minerals and vitamins needed by human daily diet. Because staple food is the main intake source of carbohydrates, especially starch, grains such as rice and wheat with starch as the main component, and tuber foods such as potatoes and sweet potatoes are regarded as staple foods by people in different regions.