In order to make full use of spinach and absorb its nutrition, we must pay attention to the following points: First, don't eat spinach and cucumber together. There will be vitamin C decomposing enzymes in cucumber, which will destroy vitamin C in spinach. Second, the cooking time should not be too long, because vitamin C is easily oxidized when heated. Third, spinach contains more oxalic acid, which is not a nutrient needed by human body. Excessive intake of oxalic acid will hinder the absorption of calcium by human body and form insoluble calcium oxalate precipitate, so blanch spinach with boiling water before eating to remove most of oxalic acid without losing carotene. Fourthly, the inorganic iron contained in spinach is an important component of hemoglobin and myoglobin. When we eat spinach, we should better absorb inorganic iron in spinach and eat more high-protein food. Fifth, spinach should not be cooked with tofu, because oxalic acid is most likely to form kidney calculi or bladder stones when combined with calcium in human body. If some calcium content is properly increased in food, the formation of stones can be prevented. It is best to eat spinach with sardines or milk, carrots and oranges. In addition, you should pay attention to eating spinach. Eating spinach in the morning can remove blood stasis, eating it at noon can enrich blood, and eating it at night can produce calcium deposition. Although spinach can strengthen the body, patients with stomach deficiency, cold and diarrhea should eat less.