Alkaline foods are foods that break down into alkaline substances after digestion by the human body, generally including vegetables, fruits, beans and other foods, such as grapes, citrus, cucumbers, carrots, soybeans. In fact, the acidity or alkalinity of food is not determined by the sense of taste, so alkaline food may also taste acidic when eaten, such as lemon, citrus, popcorn, vinegar and so on.

Differentiated by degree of alkalinity, common alkaline foods in daily life can be categorized into strongly alkaline foods, moderately alkaline foods, and weakly alkaline foods according to their strength. Strongly alkaline foods include wine, tea, kelp, grapes, citrus, persimmons, cucumber, radish, natural green algae, snails, black fungus, etc.; moderately alkaline foods include egg whites, soybeans, tomatoes, spinach, bananas, strawberries, lemons, dried plums, soybeans, carrots, tomatoes, greens, amaranth, celery, squash, dried radish, pumpkin, oranges, nori and soymilk powder, etc.; weakly alkaline foods include tofu, potatoes, collard greens, cabbage, greens, red beans, pears, apples, radishes, onions, and more.