Iron is the most important trace element needed by humans. It is an important component of the hemoglobin molecule, which absorbs oxygen in the lungs. If the human body cannot absorb a sufficient amount of iron, the number of red blood cells containing hemoglobin will decrease, and the level of hemoglobin will also drop. As a result, it will not be able to bring enough oxygen to the cells of the body, and the person will become tired, weak, and lethargic. . Foods containing more iron include: various beans, beef, chicken, eggs, liver, pork, whole grains, and dark green vegetables. Zinc is an element that is required in very small amounts and is mainly required for the activities of many enzymes in the body. Severe deficiency may cause loss of appetite and decreased taste sensitivity. In more serious cases, it may cause dwarfism or delayed puberty in men, making it difficult for wounds to heal. Mainly found in meat, liver, eggs, shells, etc. 99% of the calcium in the human body is concentrated in the bones, and the remaining calcium is involved in the excitation process of nerves, muscle contraction, and maintaining the acid-base balance of the blood. If children don't get enough vitamin D in their diet, they won't be able to absorb calcium, and if the ratio of phosphorus in their blood is too high, they'll also deplete calcium. The best calcium-supplementing food is pure dairy products, which are easier to absorb when taken in the afternoon and evening than in the morning.

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