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chewing gum = placebo effect
Indy
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It's not. I've decided to write some more about this, but now I'll add sourced. The effects of chewing gum on the brains have been known for several years now. chewing gum will activate your brain, improve your memory and concentration.
See
here for an article written in 2002. It's from
www.newscientist.
For more recent information check the health claims on the
wikipedia on chewing gum com