Why pay attention to the supply of calcium? Which foods contain more calcium? Normal people in China need 600 mg of calcium every day, 1500 ~ 2500 mg during pregnancy and 2000 mg during lactation. Through investigation, almost 100% of pregnant women in China are calcium deficient in the third trimester. 100 mg of breast milk contains 34 mg of calcium. If you milk 1000 ~ 1500 ml every day, you will lose about 500 mg of calcium. If calcium deficiency is not corrected, it will cause muscle weakness, backache and loose teeth, and even lead to bone softening and deformation in severe cases.
Calcium mainly comes from food. Milk, beans and their products have high calcium content. Seafood includes shrimp skin, kelp, Nostoc flagelliforme and laver. Auricularia, Tricholoma, Tremella, melon seeds, walnuts, raisins and peanuts are also rich in calcium, while chicken, fish and meat contain less calcium. Milk also contains a lot of calcium, but some people lack the ability to convert lactose into glucoamylase in the intestine. After drinking milk, there will be abdominal discomfort, flatulence and even diarrhea, which can be replaced by fermented yogurt. In addition, it should be noted that foods with high calcium content should not be cooked at the same time as vegetables with high oxalic acid content, otherwise calcium will be "saponified" and cannot be absorbed by the human body. It is unscientific to say spinach, leek, amaranth, garlic sprout and winter bamboo shoot. Spinach contains more oxalic acid and rich nutrition.