Spinach is known as the "model student of nutrition", it is rich in carotenoids, vitamin C, vitamin K, minerals (calcium, iron, etc.), coenzyme Q10 and other nutrients.

Oxalic acid, on the other hand, is a metabolic product of living organisms, which is widely distributed in plants, animals and fungi, and plays different functions in different living organisms. Research has found that more than 100 kinds of plants are rich in oxalic acid, especially spinach, amaranth, beet, amaranth, taro, sweet potato and rhubarb and other plants in the highest content, due to oxalic acid can reduce the bioavailability of mineral elements in the human body is easy to form calcium oxalate with calcium ions lead to kidney stones, so oxalic acid is often considered a mineral element absorption and utilization of antagonists.

After a person eats spinach, oxalic acid is generally absorbed in the stomach and the upper part of the small intestine, and most of it combines with free calcium ions in the alkaline small intestinal fluid to become insoluble calcium salts, with a bioavailability of only 2% to 10%. For normal healthy people, a very small amount of oxalic acid is absorbed generally have little effect, as long as more water to wash down the concentration, can prevent the occurrence of urinary tract stones. However, people who already suffer from urinary tract stones have a higher utilization rate of oxalic acid than normal people. Especially with chronic gastrointestinal diseases, have done a large segment of small intestine resection of people, oxalic acid absorption rate increased significantly. Therefore, these patients to not eat spinach is good. In addition, children and the elderly to eat spinach in moderation, because the oxalic acid in spinach is easy to chemical reaction with calcium in food, calcium oxalate, the body can not be absorbed and utilized to make the lack of calcium, calcium deficiency in children prone to rickets, the elderly are prone to osteoporosis.

According to the chemical properties of oxalic acid, oxalic acid starts to sublimate at 100℃, sublimes rapidly at 125℃, sublimes a lot at 157℃, and starts to decompose. As long as the spinach into the boiling water for two or three minutes, about eighty percent of the oxalic acid will be removed. But the blanching process must open the lid, so that oxalic acid can be better volatilized out.

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Spinach does contain more oxalic acid, the content of 0.97% or so, afraid of oxalic acid in the human body's small intestine is absorbed and free calcium ions combined to generate calcium oxalate crystals; and finally lead to urinary tract stones. Because there are various rumors spinach can not box tofu to eat can not be taken with milk. In fact, there is no need to worry too much about normal people and does not affect a this high-calcium foods eaten together can reduce the rate of oxalic acid absorption, loss of calcium absorption only.

In the case of people with chronic gastrointestinal disorders who have had large segments of the small intestine removed, the absorption of oxalic acid is significantly increased, and proper attention needs to be paid to controlling the amount of oxalic acid in the diet.

In fact, there is no need to worry too much, the oxalic acid in spinach can be removed 50%-80% just by blanching. Just blanch the spinach in boiling water for 1 minute in advance and remove it.

Also the oxalic acid content of spinach varies greatly depending on the variety and cultivation. In comparison, winter spinach tends to be low in oxalic acid. Summer spinach has more oxalic acid. In fact, the amount of oxalic acid is very easy to judge, if eaten in the mouth more bitter, and very astringent means that the oxalic acid content is relatively high, it is best to blanch.

Spinach is a common green leafy vegetable on our table. Some people call it "red-beaked green parrot brother", which is because it is rooted in red and green leaves, the reason for the beautiful look. It is generally believed that spinach originated in ancient Persia, the Tang Dynasty when introduced to China, so far has a history of 1300 years. Now, the footprint of spinach has spread all over the motherland, become the main vegetable varieties in winter and spring seasons.

1, spinach potassium, magnesium ion content is high

Spinach also contains surprisingly high levels of potassium ions and much higher levels of magnesium ions than other common greens. Many studies in recent years have confirmed the relevance of potassium ions in directly affecting blood pressure. Magnesium ions are also frequently mentioned in many reports, as they are thought to be very directly related to cardiac arrhythmias and myocardial infarction. Therefore, when magnesium ions drop in the blood, blood pressure will naturally drop. And proper magnesium supplementation can lead to a decrease in mortality in patients with acute myocardial infarction. In addition, research reports also show that middle-aged and elderly women suffering from high blood pressure can indeed experience a significant drop in blood pressure after taking magnesium supplements orally.

2、Vegetables rich in folic acid

Also, the folate in spinach is a nutrient that has been talked about quite a bit in recent years. It has been found that when the body is deficient in folic acid, there is a decrease in serotonin in the brain, which leads to mental disorders. Therefore, spinach, which contains a lot of folic acid, is considered to be one of the foods that can make people happy after eating it. Folic acid is even more important for women who are pregnant, as they need to get enough folic acid during pregnancy in order to prevent the occurrence of congenital defects in their newborns. It is also traditionally believed that spinach is quite high in iron, but paradoxically, iron absorption is actually low and should not be very helpful in improving iron deficiency anemia. It is worth mentioning that folic acid, when consumed adequately in raw form, can instead be helpful in improving anemia caused by folic acid deficiency.

3、Spinach is rich in nutritional value

Spinach is known as the "King of Vegetables", because it is among the nutritional value than other vegetables in general higher, it has been determined that each 100 grams of edible part of protein 2.6 grams, 0.3 grams of fat, calcium 66 mg, phosphorus 47 mg, iron 2.9 mg, vitamin C32 mg, carotene 2.96 mg, vitamin B10.04 mg, riboflavin 0.13 mg, vitamin B30.6 mg, vitamin E1.74 mg, also contains a certain amount of zinc (56-68 mg), vitamin E1.74 mg. , Vitamin B10.04 mg, Riboflavin 0.13 mg, Vitamin B30.6 mg, Vitamin E 1.74 mg, and also contains some amount of zinc (56-68 mg/kg). Studies have pointed out that eating more beta carotene can prevent cancer and many other diseases, and eating spinach for a long time can also reduce the probability of developing colorectal cancer. In two large studies conducted by Harvard Medical School, it was also found that regular consumption of beta-carotene-rich vegetables such as spinach and cauliflower can reduce the probability of developing cataracts. Eating about 100 grams of spinach a day can replenish the body's daily need for vitamin A. Eating spinach is good for your health, enhances your ability to prevent disease, provides many of the vitamins and trace elements that the body needs, and prevents night blindness, erosion of the corners of the mouth, xerostomia, labial inflammation, mouth ulcers, and inflammation of the tongue.

4、How to treat oxalic acid in spinach

Spinach contains a relatively large amount of oxalic acid, more than 0.1/100, when encountered with calcium, it will form calcium oxalate, which will affect the absorption and utilization of calcium and iron. Calcium oxalate will also be deposited in the kidneys and bladder, which can easily lead to urinary stones. Therefore, for patients with hyperuricemia, kidney stones should not eat more. However, for the oxalic acid in spinach, as long as you blanch it in boiling water, you can remove 80% of the oxalic acid. The oxalic acid in spinach has been destroyed, so not much is eaten into the body, and there is no need to worry too much. Also, you should drink plenty of water with spinach and maintain a higher urine output to minimize the formation of calcium oxalate.

Spinach is sweet, cool and non-toxic in nature, enters the lung, intestines and stomach meridian, and functions in nourishing blood, stopping bleeding and moistening dryness. The main treatment for nosebleeds, bleeding stools, urination and so on. In addition, it can also quench thirst, facilitate gastrointestinal, detoxification, and alcohol detoxification. Spinach can moisten dryness and laxative, help digestion, especially suitable for the elderly, infants and hemorrhoids patients. Spinach can stimulate pancreatic secretion, which is good for diabetes.

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