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Blood-pressure-lowering effect of a vegetarian diet: controlled trial in normotensive subjects

Study shows that a change to a vegetarian diet leads to a 5-6mmHg fall in systolic blood pressure, within 6 weeks

59 healthy, omnivorous subjects aged 25-63 years were randomly allocated to a control group, which ate an omnivorous diet for 14 weeks, or to one of two experimental groups, whose members ate an omnivorous diet for the first 2 weeks and a lacto-ovo-vegetarian diet for one of two 6-week experimental periods
Mean systolic and diastolic blood pressures did not change in the control group but fell significantly in both experimental groups during the vegetarian diet and rose significantly in the experimental group which reverted to the omnivorous diet. Adjustment of the blood-pressure changes for age, obesity, heart rate, weight change, and blood pressure before dietary change indicated a diet-related fall of some 5-6 mm Hg systolic and 2-3 mm Hg diastolic.