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Linus Pauling won a Nobel Prize in Chemistry in 1953 because he had pointed out
that atoms are held together in molecules, which later helped people to understand DNA.
In 1970, he published a book called How To Live Longer and Feel Better. In the book, the
chemist argued that vitamin C, an antioxidant, can cure common cold, flu, AIDS,
cardiovascular diseases, and even cancer. That is, antioxidants seem to help fight off
disease and aging, which are believed to be a result of free radicals.
To see if this idea was correct, researchers began to conduct long-term clinical trials
with people taking different nutrients, such as vitamins C and E, beta-carotene, folic acid,
and so on. In 2012, a review of 27 such studies was published: seven found some benefits,
ten found no benefits, while ten showed unwanted negative results. For example, a study
in 2007 showed that men who took multivitamins were twice as likely to die from prostate
cancer. Another stud y in 2010 showed that men who took selenium and vitamin E sa w an
increased prostate cancer by 17%. What’s worse, one study in 2011 had to end earlier
because after four years of taking vitamin A and beta-carotene, there was a 28% increase
in lung cancer rates and a 17% increase of death rates.
Human biochemistry does not solely mean using antioxidants to neutralize free
radicals, which break and kill cells. In fact, free radicals are not evil guys that shouldn’t be
found in the human body. Instead, they are needed when food and oxygen are turned into
energy. Besides, they play an important role when cells grow, divide, and die. Also, they
kill bacteria trapped by the immune system. Without them, the defense of human health
cannot do its job well.
Are antioxidants all good and free radicals all bad? The answer is not just a yes or no.
In a word, the human body is not as ______ as a beaker: When the solution is too acid, you
just add some alkali to neutralize it. It just doesn’t work that way.