Factors such as diet, body weight, physical activity and alcohol intake play a role in the risk of developing hypertension, researchers said.
Dietary modifications have been shown to be effective for preventing and managing hypertension, according to research author Yoko Yokoyama, of the National Cerebral and Cardiovascular Center, Osaka, Japan, and colleagues.
The authors analysed seven clinical trials and 32 studies published from 1900 to 2013 in which participants ate a vegetarian diet.
Net differences in BP associated with eating a vegetarian diet were measured, researchers said.
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In the 32 studies, eating a vegetarian diet was associated with lower average systolic and diastolic BP, compared with omnivorous diets.
"Further studies are required to clarify which types of vegetarian diets are most strongly associated with lower BP. Research into the implementation of such diets, either as public health initiatives aiming at prevention of hypertension or in clinical settings, would also be of great potential value," researchers said.