“We found no association for diet beverage consumption or caffeine intake and blood pressure,” notes Dr. Chen, “suggesting that sugar may actually be the nutrient that is associated with blood pressure and not caffeine which many people would suspect.”
The research, which was supported by a grant from the National Heart, Lung, and Blood Institute of the National Institutes of Health, analyzed dietary intake and blood pressure of 810 adults measured at baseline, 6 and 18 months. After known risk factors of high blood pressure were controlled for, a reduction in sugar-sweetened beverage consumption of one serving per day was associated with a drop of 1.8 mm Hg in systolic pressure and 1.1 mm Hg in diastolic blood pressure over 18 months.
After additional adjustment for weight change over the same period, a reduction in the consumption of sugar-sweetened beverages was still significantly associated with blood pressure reduction.
“By reducing the amount of sugar in your diet, you are also reducing the number of calories you consume and may lose weight,” adds Dr. Chen. “But even among those whose weight was stable, we still found that people who drank fewer sugary sodas lowered their blood pressure.”