In a study likely to make school cleaners cringe, US researchers said that chewing gum may boost academic performance in teenagers.
Many US schools ban chewing gum because children often dispose of the sticky gum under chairs or tables. But a team led by Craig Johnston at Baylor College of Medicine in Houston found that learners who chewed gum during math's class had higher scores on a standardised math test after 14 weeks and better grades at the end of the term than learners in the class who did not chew gum. The study was funded by chewing gum maker Wrigley.
"For the first time we've been able to show in a real-life kind of situation that learners did perform better when they were allowed to chew," said Gil Leveille, executive director of the Wrigley Science Institute, a research arm of Wm Wrigley Jr Co, which is now a part of Mars Inc.
Leveille said Wrigley has gotten feedback from many of its gum customers who say chewing gum helps them stay focused. So, four years ago the company started the science institute to see if some of these claims have merit.
How the study was done
The researchers at Baylor studied four math's classes or 108 learners aged 13 to 16 years old from a Houston, Texas, charter school that serves mostly low-income Hispanic learners.
About half got free Wrigley's sugar-free gum to chew during class, homework and tests. They chewed at least one stick of gum 86% of the time they were in math class and 36% of the time they were doing homework. The other half went without.
After 14 weeks, the gum chewers had a 3% increase in their math scores on the Texas Assessment of Knowledge and Skills achievement test, a small but statistically significant change, according to Johnston and colleagues, who presented their findings at the American Society for Nutrition scientific meeting in New Orleans.
They found no difference in math scores between the two groups in another test called the Woodcock Johnson III Tests of Achievement. However, the gum-chewers did get better final grades in the class than their non-chewing peers.
Second study's results similar
Another Wrigley-funded study found that college learners in a lab who were given difficult computer tasks had lower levels of the stress hormone cortisol when they were chewing gum compared to when they were not.
Leveille said he thinks chewing gum helps reduce stress so learners can do their best work. And while he is aware that many schools have a dim view of learners chewing gum in class, he hopes the findings may change that a bit.
"It's not a matter of chewing. It's a matter of gum disposal," Leveille said, adding that that can be overcome by teaching proper disposal behaviours.
If that fails, he quipped, "We'll have to provide the cleaners with scrapers." – (Reuters Health, April 2009)
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