Chewing gum might be good for your brain. One Japanese study of nine participants found that chewing gum boosted the flow of blood to participants' brains by up to 40 percent. Blood carries oxygen, which fuels brain cells.

　　Other small studies have found that people perform better on memory tests while chewing gum. And a study in the United Kingdom found that people who chewed gum while memorizing a list of words did about 25 percent better at recalling those words than people who didn't chew gum.

　　But additional studies are still needed to confirm that chewing gum has benefits. So far, results of studies about memory have been mixed. Not all tests have had similarly encouraging results. What's more, many of the studies that show gum's benefits are funded by gum companies.

　　So, for now, chew with caution. Too much chewing can damage the jaw joint. And chewing too much of a gum that contains vitamins, caffeine, or a medicine could lead to an overdose(过量). What's more, no matter how healthy gum chewing proves to be, it will never be a match for a healthy lifestyle. Nothing like a gum or a vitamin is going to cure a bad eating habit or a bad exercise habit. It's not a magic bullet.

　　67．Scientific studies about gum chewing show that________.

　　A. it can help fight serious diseases

　　B. it can help blood produce more oxygen

　　C. it can help reduce headaches

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