1, improperly cooked food elderly people because of bad teeth or most of the loss, in the cooking of dishes often add water to boil some in order to chew, over the years prone to anemia. This is because this cooking method leads to the loss of folic acid and affects hematopoiesis. Folic acid is an important raw material for hematopoiesis and is widely found in various foods, most abundant in fresh green vegetables, but it is unstable and easily destroyed during heating. Therefore, vegetables should not be cooked with water for too long to avoid a large loss of folic acid, which can lead to megaloblastic anemia if lacking for 3-4 months. If the elderly cannot eat hard food, they can make a paste of melon and fruit to ensure the intake of folic acid, or they can take folic acid tablets orally. 2, vegetarianism Some elderly people believe in vegetarianism, that “to live long, eat more vegetarian”, Christian people also advocate “not to kill” and eat vegetarian food, but nutrition shows that the iron content of animal food and iron absorption rate is higher than that of plant food, the human body needs vitamin B12 is also mainly from the plant food. However, nutrition shows that the iron content and iron absorption rate of animal foods are higher than that of plant foods, and the vitamin B12 required by human body mainly comes from animal foods such as meat, liver, fish, eggs, dairy products, etc. Eating only vegetarian food will definitely lead to iron deficiency and vitamin B12 deficiency, and long-term vegetarianism may lead to iron deficiency anemia or nutritional macrocytic anemia. Therefore, in the diet structure we advocate meat and vegetarian, mixed meals. 3. In addition to sugar, fat and protein, we also need to take in the right amount of vitamins and trace elements, which are also essential to maintain life activities. Iron, folic acid and vitamin B12, which are used in hematopoiesis, are present in different foods, and deficiencies of other vitamins such as vitamin B6, riboflavin, vitamin C, vitamin A and vitamin E can also lead to different degrees of anemia. One study showed that after 310 days of eating a diet deficient in vitamin A, hemoglobin decreased by approximately 50 g/L. Vitamin C affects hematopoiesis by affecting the metabolism of folic acid and iron. Vitamin B6 is involved in hematopoiesis as a coenzyme. Perverse and picky eating can make various nutrients related to hematopoiesis deficient, thus leading to anemia. 4. Excessive alcohol consumption will affect the absorption of folic acid, which can also directly damage the hematopoietic cells of the red system; long-term heavy alcohol consumption will lead to liver cell damage, bile depression, and a significant increase in the ratio of phospholipids and cholesterol in the blood, at which time the lipid composition of red blood cells is changed, and red blood cells become brittle and easily destroyed in the spleen; if alcoholic pancreatitis occurs, the latter releases lipase to directly damage red blood cells and intravascular hemolysis occurs. All of the above factors eventually lead to anemia. 5, drinking tea although tea can supplement folic acid and vitamin B12, but it may affect the absorption of iron, leading to iron deficiency anemia. Because tea contains a lot of tannic acid, tannic acid telegraph combined with iron to form insoluble iron tannate, hindering the absorption of iron. In particular, some people like to drink strong tea after meals, which has a great impact on the absorption of iron. Friends who like to drink tea can consider drinking light tea, it is best not to drink tea within 2 hours of eating to ensure the normal absorption of iron.