Chewing sugary gum after beetroot could lower blood pressure

A simple habit of chewing sugary gum after eating nitrate-rich vegetables such as beetroot, spinach and kale could temporarily boost their blood pressure-lowering benefits, according to a new study by researchers at King’s College London. Researchers found that volunteers who chewed sugary gum after drinking beetroot juice had higher nitrite levels and modest reductions in blood pressure compared to those who chewed sugar-free gum.
Nitrate found in vegetables cannot be directly used by the body. It first needs to be converted into nitrite by bacteria living in the mouth. Once formed, nitrite helps blood vessels relax and widen, allowing blood to flow more easily through the body.
Researchers wanted to investigate whether making saliva more acidic could improve this conversion process.
“Whether and how the acidity of saliva impacts the conversion of inactive nitrate into the more active nitrite is a fundamental question, as it affects important functions including blood pressure,”said Dr Andrew Webb, Clinical Senior Lecturer at King’s College London.
Previous research by the team had shown that grapefruit juice reduced saliva acidity and slowed nitrate conversion. The scientists therefore wanted to see if increasing acidity would have the opposite effect.
Healthy volunteers drank a shot of beetroot juice and were randomly assigned to chew either a sugar-containing chewing gum or a sugar-free gum for three to six hours. At least a week later, participants repeated the experiment with the other type of gum. Researchers monitored blood pressure and analysed blood and saliva samples throughout the study. Chewing sugary gum increased saliva acidity significantly, causing a 1.4-point drop in pH compared to sugar-free gum. Participants also recorded a 45% increase in nitrite levels in the mouth and a 25% increase in nitrite levels circulating throughout the body.