Corn, also known as corn, corn cob and corn cob, is called "pearl jade" because of its rich nutrition and imported from abroad. About16th century, foreign emissaries took the ear of corn as a gift to welcome Emperor China. In this way, corn was introduced into China and planted by working people. After years of planting, China has also cultivated a new type of waxy corn. The famous varieties are banxian waxy, Duosui white, Licheng sticky, yellow corn and so on.

According to reports, the White House nutritionist arranged two meals of corn porridge for US President Barack Obama in the weekly cookbook. Nutritionists agree that corn has the highest nutritional value and health care function among all human staple foods.

The content of vitamins is many times that of rice, wheat and corn. Besides carbohydrates, protein, fat and carotene, corn also contains riboflavin and other nutrients. Experts compared the nutritional value and health care function of many staple foods such as corn, rice and wheat. The vitamin content in corn is very high, which is 5- 10 times that of rice and wheat, while the nutritional value of special corn is higher than that of ordinary corn. For example, the content of protein, vegetable oil and vitamins in sweet corn is 1-2 times higher than that in common corn, and the content of "life element" selenium is 8- 10 times higher. Among 17 amino acids, 13 amino acids are higher than common corn.

The calcium content is close to dairy products. Scientific tests have confirmed that every100g of corn can provide nearly 300mg of calcium, which is almost the same as that contained in dairy products. Rich calcium can lower blood pressure. If you take 1 g calcium every day, your blood pressure will drop by 9% after 6 weeks. Plant cellulose in corn can accelerate the discharge of carcinogens and other poisons; Natural vitamin E has the functions of promoting cell division, delaying aging, preventing skin lesions, relieving arteriosclerosis and brain function decline. Lutein and zeaxanthin contained in corn can resist eye aging, stimulate brain cells and enhance people's brain power and memory.

American researchers also found that eating corn husks and corn oil regularly is very beneficial to lowering human cholesterol. They selected 70 elderly people with an average age of 55, including 50 males and 20 females. These people have high cholesterol content and have been hospitalized for more than 2 years, but the effect is not satisfactory. When these people were tested, the researchers ground corn, mixed it with garlic powder, black pepper and celery, and made it into food with tomatoes or soup. Everyone eats 20 grams a day for one and a half months before the test and 40 grams a day for the next month and a half. Three months later, it was found that 70 people's blood triglycerides decreased and 60 people's cholesterol decreased.

Glutathione contained in corn with anticancer effect is an anticancer factor, which can be combined with other substances to make it lose carcinogenicity. Carotene contained in corn can be converted into vitamin A after being absorbed by human body, which has certain anti-cancer effect. Corn contains more plant cellulose, which has the function of relaxing bowels and can accelerate the discharge of carcinogens and other poisons, thus reducing the possibility of colon cancer.

From the health point of view, it is far more beneficial for people to eat corn oil than peanut oil and other vegetable oils. Corn flour contains a lot of leucine and glutathione, which can inhibit the side effects of anticancer drugs on human body and inhibit tumor growth. Because glutathione can lock the growth of carcinogen like a chain, make it lose its toxicity and eventually excrete it.

Adjuvant treatment of many diseases Chinese medicine believes that corn is flat and sweet, and has the functions of appetizing, strengthening the spleen, removing dampness and diuresis, and is mainly used for diarrhea, dyspepsia and edema. Corn is rich in unsaturated fatty acids, especially linoleic acid, with the content exceeding 60%. It cooperates with vitamin E in corn germ, which can reduce blood cholesterol concentration and prevent it from depositing on blood vessel wall. Therefore, corn has certain preventive and therapeutic effects on coronary heart disease, atherosclerosis, hyperlipidemia and hypertension. Vitamin E can also promote cell division and delay aging. Corn also contains a longevity factor-glutathione, which will produce glutathione oxidase with the participation of selenium, which has the functions of restoring youth and delaying aging. It is rich in calcium, phosphorus, magnesium, iron, selenium, vitamins A, B2, B6, vitamin E and carotene. It has adjuvant therapeutic effect on cholecystitis, gallstones, icteric hepatitis and diabetes.

There are many ways to improve nutritious corn by eating coarse grains. For example, it is ideal to chew a "cooking stick" every day when tender corn is on the market; You can cook porridge with rice (or millet) and corn flour in summer. In other seasons, you can only cook porridge with corn flour. When cooking corn porridge, adding a spoonful of soda ash or baking soda can separate the combined calcium pantothenate, which is beneficial to human absorption. Mixing corn flour and soybean flour at the ratio of 3∶ 1 is a method recommended by the World Health Organization to eat coarse grains carefully and improve their nutritional value. Besides cooking corn, there are many ways to cook corn, such as corn flipping, corn tortillas, corn sparerib soup, fried sausage with corn green beans, roasted corn, popcorn and so on.