Assertion: chewing gum | /r/CapableOf | enhance alertness
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Source sentences:
text: Chewing gum can enhance alertness and sustained attention, although its effects upon stress may differ depending upon whether chronic or acute stress is examined; see reviews by Allen and Smith  and Hirano and Onozuka .
text: If chewing gum can enhance attention and alertness, or at least prevent them from slipping, then it could result in improved performance in applied contexts,” ​the researchers said.