Chewing on a piece or two of gum, it seems, helps force fluids back into the stomach and flood the esophagus with alkaline saliva, neutralizing acids that cause the characteristic burning sensations.
The pieces cites a pair of studies: One in which participants fasted before eating a meal intended to cause acid reflux. Some were then chosen to chew sugar-free gum for 30 minutes. The study found that acid levels were significantly lower in the two hours following the meal when the participants chewed gum.
Chewing Gum for Heartburn
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