Taking vitamin supplements is good for your health

“God, I actually spent so much money!” When she saw a report titled “The use of vitamin tablets is not good for health,” 33-year-old Su Mei exclaimed. For more than 10 years, she has been taking a variety of vitamin tablets, in addition to a multivitamin tablet per day, plus a calcium tablet. Most of these were purchased by her friends from the United States, Canada, Hong Kong, and other places.

“I always feel that my body is short of vitamins, so I will make a good heart every day. Sometimes I have no vegetables or fruits for several days, I will comfort myself and say that there is a vitamin tablet substitute anyway.” Su Mei said.

However, the research paper published in the authoritative medical journal “The Internal Medicine Yearbook” broke Su Mei’s worship of vitamin tablets. On December 17, scientists analyzed a large-scale comprehensive study involving 500,000 people and pointed out that taking vitamin supplements almost without exception is a waste of money, which is not good for health.

Analysts pointed out that this study is a major blow to the vitamin supplement market. In the United States, the use of vitamin supplements has exceeded half of the national population. In 2010, the US market share of supplements was as high as 28 billion US dollars (about 170 billion yuan). The annual sales of UK supplements is 650 million pounds (about 6.4 billion yuan), involving about one-third of the national population.

“China is relatively small, probably accounting for 10%-20% of the proportion,” said Chen Yuming, a member of the China Nutrition Society’s revised reference group for dietary nutrient reference intake and a professor at the School of Public Health at Sun Yat-Sen University. “Most of the education is higher. According to the statistics of the China Health Care Association Market Working Committee, in 2011, the market share of China’s nutritional supplements was around 77 billion yuan.

But Edgar Miller, a researcher at the Johns Hopkins University School of Medicine, told the China Youth Daily: “Whether it’s the United States or China, people who are well-nourished have no vitamin supplements. Necessary, otherwise there will be no obvious benefits, but it may be harmful.”

Some people claim that there are many nutritional deficiencies in the diet, but in fact, we usually have enough nutrition.

Initially exposed to vitamin supplements, Su Mei was impressed by his advertisement. “It feels like the elixir of Laojun, a few large baskets of green leafy vegetables and fresh fruits turned into a fingernail-sized vitamin. Some advertisements have shaped vitamin tablets into healthy shields, and I feel that eating can resist various kinds of Disease,” Su Mei recalled. She also buys for parents and supervises them to take them every day.

Many scientists are also fans of vitamins. Zheng Jisheng, a well-known biochemist and professor of nutrition at Nanjing University, insisted on taking 10,000 micrograms of retinol equivalent (sugar) of vitamin A, 600 mg of vitamin C, 10 mg of vitamin B1 and 100 mg of vitamin E per day. Professor Ge Kyou, former chairman of the Chinese Nutrition Society, said in 2003 that he took vitamin C 400 mg a day and has been insisting for 10 years.

Many people believe that as a basic element to maintain the normal function of biological organisms, vitamins not only maintain life and metabolism, but also delay aging, lower cholesterol, help to lose weight, excrete toxins from the body, prevent chronic diseases, and even prevent cancer.

However, many studies in recent years have made a near-subversive conclusion about the role of vitamins. In 2007, the Journal of the American Medical Association published a study done by a multi-national researcher. It found that 4% increased mortality in the overdose of vitamin E, 7% increased mortality from taking beta carotene and increased mortality from taking vitamin A. %, and there is no evidence that vitamin C can prolong life.

The article published today in the Annals of Internal Medicine is called the “finalization” of vitamin supplements. “That is, no further research is needed,” added Lu Jie, a Chinese physician at the University of California Hospital.

The authors, three from the Johns Hopkins School of Medicine, one from the University of Walker Medical School, and one is the senior deputy editor of the magazine, “all are medical leaders.” They came to this conclusion, and three papers were published in the current issue.

In the first study, the US Disease Prevention Task Force System reviewed 27 clinical studies on vitamin supplements and disease prevention. More than 400,000 participants confirmed that there is no evidence that vitamin supplements can reduce any mortality and prevent it. Cardiovascular disease or cancer. Moreover, smokers who take only beta carotene have an increased risk of lung cancer.

At the same time, Harvard Medical School published a randomized double-blind controlled trial of large populations. They tracked 5,947 elderly people over the age of 65 for 12 years, and these elderly people took a multivitamin or placebo daily. The final conclusion is that long-term use of multivitamins does not have any benefit for the cognitive and language skills of the elderly.

In the last study, the American Heart, Lung, and Blood Disease Institute and the Center for Alternative Medicine observed 1,708 patients who had experienced a heart attack. These people took multivitamins or placebo twice a day for five years, but more than half of them stopped taking it, so it was difficult for the author to make any practical conclusions about vitamin availability.

Looking back at all the current large research results on vitamin supplements, scientists say the evidence is already sufficient: “These vitamins should not be used to prevent chronic diseases, just to stop.”

“We don’t advocate eating vitamin supplements, especially high-dose supplements, which are often harmful,” Miller said. “Some people claim that our diet has many nutritional deficiencies, but in fact, we eat too much overall, we usually The nutrition is completely sufficient.”

Don’t wait for the Americans to wait until the vitamin tablets are flooded, and then reflect on this matter.

According to Lu Jie, Americans have been taking vitamin supplements for 30 to 40 years. He works and lives in Los Angeles. Many local supermarkets have a wall that is full of various supplements and health supplements. There are hundreds and thousands of them, and they are not expensive. A few dollars can be eaten for a year.

Nowadays, Americans are eating vitamin supplements to the point of “flooding”. Some people joked that American urine is the most expensive urine in the world because many of the water-soluble vitamins that are supplemented are lost with the urine.

As early as more than 40 years ago, Nobel laureate and biochemist Linus Pauling first advocated “high dose” of taking vitamin C, which is good for health and cancer. His daily dose was 18,000 mg (about 300 times the recommended daily intake). People also take a lot of money, and pharmacies are in short supply. By the mid-1970s, 50 million Americans had listened to Pauling’s advice, and vitamin producers called it the Linus Pauling effect.

In May 1980, Pauling was interviewed at Oregon State University. When asked if “the long-term use of vitamin C has no side effects,” Pauling’s answer quickly and decisively: “There will be no side effects.” Seven months later, his wife died of stomach cancer. In 1994, Pauling died of prostate cancer. Nowadays, a large number of scientific examples prove that vitamin C is not effective in treating colds and preventing cancer.

“China has also been popular for more than a decade.” Chen Yuming told the China Youth Daily reporter. Many pharmacies in Beijing have opened up special-purpose drug-producing areas, just like the “best-selling book counters” in bookstores. The exquisite packaging is printed with a confident smile from the star, and the bottle is filled with yellow transparent pills. Wearing a white coat, the self-proclaimed “doctor” guide told reporters: “These nutritional products are very popular.”

Lv Jie expressed concern about this: “Like China, we should face this fact before the situation has not fully expanded, instead of saying that you see Americans too, I will eat it, and then reflect on this issue after something happens. ”

Yu Kang, a clinical nutrition doctor at Peking Union Medical College Hospital, pointed out that the study of the Internal Medicine Yearbook is mainly based on the European and American populations. Unlike the Chinese, it cannot be used directly, and according to some domestic studies, many Chinese people have insufficient vitamin intake.

This is also the view held by some domestic nutritionists. Wang Lijun, a national level public nutritionist, is one of them. In Wang Leijun’s view, China’s cooking methods are more popular, and vitamins will be lost in the process. In addition, smog weather will cause a lack of vitamin D in the human body. Because of his teaching tasks, he often feels uncomfortable. Wang Lijun eats a vitamin supplement every day. He believes that it is difficult to get enough vitamins in fruits and vegetables every day.

At the 11th National Nutrition Science Conference of the Chinese Nutrition Society held in Hangzhou in May this year, the reference intake of vitamin C per day for adults was adjusted from 100 mg to 200 mg, with an upper limit of 1000 mg. The recommended daily intake of vitamin A is 800ugRE (male) and 700ugRE (female). Chen Yuming said that this amount is based on the number of vegetables lost during the cooking process.

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