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MINERALS
There are more than 20 different minerals in the body. The human body contains 65 per cent oxygen, 18 per cent carbon, 10 per cent hydrogen, 3 per cent nitrogen, about 2 per cent calcium and 1 per cent phosphorus. Then there are small quantities of sulphur, chlorine, magnesium, iron, copper, iodine, fluorine, cobalt, zink and others.
Three of the most important minerals are calcium, phosphorus and iron. Calcium and phosphorus work together. The bones and teeth have 99 per cent of the calcium in the body, in the form of calcium phosphate. If people have enough calcium and phosphorus their bones and teeth will be strong and hard. In addition, their muscles, nerves and heart will work correctly. Milk and hard cheeses are the best sources of calcium. Calcium compounds are present in fruits, vegetables and fish, phosphates - in eggs, meat and fish. In general, if one gets enough protein and calcium he will also get enough phosphorus.
The red colour of the blood is the colour of the hemoglobin, which contains one atom of iron among its ten thousand atoms. As iron carries oxygen, people who do not have enough iron do not get enough oxygen for their normal activities. Iron is found in kidney, liver, other meat products, some vegetables, dried fruits and bread.
A small quantity of iodine is also necessary for good nutrition - probably less than one ten-thousandth of a gramme daily. Deficiency of iodine results in an overgrowth of the thyroid gland. Sea foods are rich in this element.
Fluorine is a constituent of the enamel of the teeth but it is absent from most foods. So many cities now add traces of fluorine to the water supply, besides small amounts of fluorine are added to various toothpastes.