2. Oranges are cool fruits. Oranges are cool and taste sour and sweet. Usually the cold fruits we eat are oranges, cantaloupes, watermelons, persimmons, pears, bananas, grapefruit and so on. Warm fruits include litchi, longan, bayberry, apricot and cherry. Usually, some people with strong "internal heat" have strong metabolism and sweat a lot, and are prone to oral ulcers or constipation. Eating cold fruits often helps to reduce fire and detoxify, but eating cold fruits too much will lead to qi deficiency and spleen and stomach discomfort. Therefore, patients with qi deficiency and weakness should be more cautious when eating cold fruits.