"Chemical Elements and Human Health" Chemistry and Life PPT Courseware 5

"Chemical Elements and Human Health" Chemistry and Life PPT Courseware 5

The elements needed by the human body include C H O N Ca I S P Fe Zn F Cu, etc. Some of these elements have higher content, such as C H O N S P Ca, while some elements have very little content in the human body. All elements are found mainly in water, organic matter and some inorganic salts.

Macroelements: Content exceeding 0.01% in the human body such as calcium, phosphorus, potassium, etc.;

Trace elements: those with content below 0.01%, such as iron, zinc, selenium, iodine, etc.;

Toxic elements: Pb Cd Hg

calcium

Calcium provides the strong structural scaffolding for bones and teeth. Calcium deficiency in young children and adolescents can cause rickets and stunted growth. Calcium deficiency in the elderly can lead to osteoporosis and fractures easily.

iron

Iron is a component of hemoglobin and can help transport oxygen. Iron deficiency can cause anemia. Iron deficiency can cause iron deficiency anemia, which can cause physical weakness, pale skin, fatigue, dizziness, sensitivity to cold, shortness of breath, and hypothyroidism.

Excessive iron intake (will produce chronic or acute iron poisoning. Chronic moderate symptoms are: the liver containing a large amount of iron will lead to cirrhosis, pancreatic fibrosis, etc. Acute iron poisoning causes severe and extensive necrosis of the gastrointestinal epithelium, eventually leading to death.

zinc

Zinc affects human development, and the most common cause of zinc deficiency is an unbalanced diet. Zinc deficiency is characterized by loss of appetite, retardation of growth and development, rough and cracked skin, loss of taste sensitivity, lightening of hair pigment, white spots on nails, slow wound healing, etc. Zinc deficiency in pregnant women may even cause fetal malformations.

selenium

Selenium has anti-cancer and anti-cancer effects. Selenium deficiency is an important cause of Keshan disease. Selenium deficiency can induce liver necrosis, and selenium deficiency can induce cardiovascular disease. In people with mild or moderate selenium deficiency, the signs and symptoms are not obvious. Excessive intake of selenium will cause selenium poisoning, the symptoms of which are: gastrointestinal disorders, ascites, anemia, hair loss, nail and skin deformation, and liver damage. Normal people are at risk of poisoning if they consume 50 times more selenium than their physiological requirements.

Unscientific traditional food

From a nutritional point of view, some of my country's traditional food combinations are not beneficial to human health, or even harmful.

Boiled eggs with tea leaves: In addition to alkaloids, tea also contains acidic substances. These compounds combine with the iron in eggs, irritating the stomach and hindering digestion and absorption.

Add MSG to scrambled eggs: Eggs themselves contain a lot of glutamic acid that has the same component as MSG, so there is no need to add MSG when scrambling eggs.

Eat red and white radish together: The VC content in white radish is extremely high, but red radish contains a decomposing enzyme that destroys blood acid, which will destroy the VC in white radish.

Eating radish and fruit together: The metabolism of radish will produce an anti-thyroid substance-thiocyanate. Plant pigments in oranges, pears, apples, grapes and other fruits are decomposed by bacteria in the intestines and converted into hydroxybenzoic acid and ferulic acid, which can strengthen thiocyanic acid. The pigments in oranges, pears, apples, grapes and other fruits are decomposed by bacteria in the intestines and converted into hydroxybenzoic acid and ferulic acid, which can enhance the inhibitory effect of thiocyanate on the thyroid gland and induce or lead to thyroid enlargement.

Eating milk and oranges together: The protein in milk and the fruit acid in oranges can easily coagulate into lumps, causing symptoms such as abdominal distension, abdominal pain, and diarrhea.

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