Most people can’t resist the sweet taste of soda or fruit drinks.
But according to a recent study published in Hypertension: Journal of the American Heart Association, soda and other sugar-sweetened beverages such as fruit drinks are associated with higher blood pressure levels in adults.
In the International Study of Macro/Micronutrients and Blood Pressure, also known as Intermap, participants on average had significantly higher systolic blood pressure by 1.6 millimeters of mercury and diastolic blood pressure higher by 0.8 mm Hg for every extra, sugar-sweetened beverage drank per day.
Researchers also said that this remained statistically significant even after adjusting for differences in body mass.
The study stated that researchers found higher blood pressure levels in individuals who consumed more glucose and fructose, both sweeteners that are found in high-fructose corn syrup, the most common sugar sweetener used by the beverage industry.
Higher blood pressure was more pronounced in people who consumed high levels of both sugar and sodium, the study stated, and researchers found no consistent association between diet soda intake and blood pressure levels.
Those who drank diet soda had higher mean body mass index than those who did not and lower levels of physical activity.
“This points to another possible intervention to lower blood pressure,” said Paul Elliott, senior author and professor in the Department of Epidemiology and Biostatistics in the School of Public Health at Imperial College London. “These findings lend support for recommendations to reduce the intake of sugar-sweetened beverages, as well as added sugars and sodium in an effort to reduce blood pressure and improve cardiovascular health.”
In the Intermap study, researchers analyzed consumption of sugar-sweetened drinks, sugars and diet beverages in 2,696 participants, 40- to 59-years-old, in eight areas of the United States and two areas of the United Kingdom.
Participants in the study reported what they ate and drank for four days by in-depth interviews with trained observers, underwent two 24-hour urine collections, eight blood pressure readings and responded to a detailed questionnaire on lifestyle, medical and social factors.
The study found that sugar intake in the form of glucose, fructose and sucrose was highest in those consuming more than one sugar-sweetened beverage daily.
Researchers also found that individuals consuming more than one serving per day of sugar-sweetened beverages consumed more calories than those who didn’t, with average energy intake of more than 397 calories per day.
Those who did not consume sugar-sweetened beverages had lower average BMI than those who consumed more than one of these drinks daily.
“People who drink a lot of sugar-sweetened beverages appear to have less healthy diets,” said Ian Brown, research associate at Imperial College London. “They are consuming empty calories without the nutritional benefits of real food. They consume less potassium, magnesium and calcium.
“One possible mechanism for sugar-sweetened beverages and fructose increasing blood pressure levels is a resultant increase in the level of uric acid in the blood that may in turn lower the nitric oxide required to keep the blood vessels dilated. Sugar consumption also has been linked to enhanced sympathetic nervous system activity and sodium retention.”
The study’s limitations include that it was cross-sectional and diet was self-reported.
“This is a population study. It’s one piece of the evidence in a jigsaw puzzle that needs to be completed,” Brown said. “In the meantime, people who want to drink sugar-sweetened beverages should do so only in moderation.”
The American Heart Association recommends no more than half of the discretionary calorie allowance from added sugars, which for most American women is no more than 100 calories per day and for most American men no more than 150 calories per day.
The American Heart Association defines discretionary calories as the remaining calories in a person’s “energy allowance” after consuming the recommended types and amounts of foods to meet all daily nutrient requirements.