Whether you can get enough calcium from food will affect the development and health of teeth and bones. What is the calcium intake of primary and secondary school students in China?
1992 the third national nutrition survey found that the calcium obtained by primary and secondary school students in China from food is very low, and the average daily intake of calcium is less than half of the recommended supply. This has little to do with their usual consumption of milk and dairy products. 1994 A survey in Beijing found that 60% of primary and middle school students never drink milk. Milk and dairy products are rich in calcium, which is easily absorbed and utilized by human body, and is the best and most economical calcium source. Therefore, people often say that "a glass of milk a day keeps the bones healthy".
More and more countries in the world associate students' drinking milk with the prosperity of the country. Britain, Japan, Mexico, South Africa, Malaysia, Thailand and many other countries have launched the "school milk Plan". Japan put forward the slogan "A glass of milk makes a nation strong", and every school child must drink 200ml of milk every day. Thailand has implemented the "School Milk Program" since 1985, which has greatly promoted the growth and development of students.
In our country's eating habits, infants generally drink milk and wean their children after 2 years old. Dietary behavior is cultivated from childhood, drinking "milk" from childhood, and there is no habit of drinking milk when you grow up. Therefore, for the sake of children's health, don't "wean" children. Let them keep the habit of drinking milk, at least one glass of milk every day. Due to the shortage of dairy products in rural and poverty-stricken areas, local food resources can be used to make soybean milk for students. If every student can be guaranteed to drink a cup of delicious soybean milk every day, it can also play a role in supplementing calcium to a certain extent.
In addition, shrimp skin, kelp, sesame sauce, bean products, etc. are also rich in calcium, and regular consumption is also conducive to calcium supplementation.
For health, drink a glass of milk every day!
Many mothers think that their children have rickets when they were young, which is a sign of "calcium deficiency" when they see their legs are not straight, their heads are big, their breasts are chicken, their ribs are everted and their upper arms are bent. Therefore, blindly buy calcium-containing health care products for children and force children to eat calcium tablets and calcium powder. In fact, all the above symptoms are lack of vitamin D, because vitamin D can help calcium and phosphorus to deposit on bones and make bones hard. Without vitamin D, calcium can't be absorbed by human body.
Why is it wrong to supplement calcium alone? It turns out that bones are composed of organic matter and inorganic matter. Organic substances, including protein, mucopolysaccharide and fat, constitute various cells and tissues of bones, which determine the elasticity and toughness of bones. Inorganic substances, including calcium salt, phosphorus salt and sodium salt, determine the hardness of bones. Therefore, human bones are both hard and elastic.
Inorganic substances are like steel bars in bones, and organic substances are concrete around steel bars. When steel bars and concrete are combined, they are both firm and hard. Cement and sand in concrete are synthesized in proportion, so they have cohesive force. There must be a certain proportion of calcium and phosphorus, just like cement and sand, in order to have hardness. The function of vitamin D is to promote the absorption of calcium and phosphorus by intestinal mucosal cells and make them deposit in bones. If the body lacks vitamin D, it will directly affect the absorption and storage of calcium and phosphorus, making it difficult for bones to calcify. It can be seen that calcium, phosphorus and vitamin D are closely related and indispensable.
The symptoms of "calcium deficiency" usually appear before the baby is 3 years old, because this is the fastest growth and development stage in their life. If it is not properly fed, exposed to the sun and treated in time, the growing bones will not harden, and the bones will be deformed, leaving sequelae. This sequela is medically called late rickets, which generally occurs in students over 5-6 years old, especially in students aged 8- 12 years old.
If primary and secondary school students have numbness of lower limbs, pain during activities, fatigue, bone deformation, etc., parents should pay attention to taking calcium supplementation measures in time:
● Eat a balanced diet and drink more milk twice a day;
● Get more sunshine and do more outdoor activities;
● Strengthen exercise, skate in winter and swim in summer;
● Under the guidance of doctors and nutritionists, take cod liver oil in moderation while eating calcium tablets.