Body Mass Index at Age 17 Within the Normal Range Can Predict Future Risk for Hypertension in Later Life

Watch your BMI, kids.

Ben-Gurion University of the Negev (BGU) researchers reveal in a new, large-scale study that "normal" blood pressure at age 17 can still predict hypertension at early adulthood and that teenage boys are three to four times more likely to develop high blood pressure in early adulthood than girls...

The BGU researchers examined the development of blood pressure from adolescence to young adulthood in 23,191 boys and 3,789 girls from ages 17 to 42 by taking regular readings of their blood pressure and BMI of Israel Defense Forces personnel who were not hypertensive at age 17 in their initial evaluation before recruitment.

The study revealed two substantive findings:

In boys, there is a strong correlation between blood pressure and BMI at age 17. This means that while the blood pressure reading may be in the "normal range," there is a greater risk for hypertension when BMI is also evaluated. The rate of progression to hypertension is higher in boys whose systolic blood pressure is 110 versus those whose blood pressure is 100.

For girls, only the sub-group considered obese had substantially higher risk of high blood pressure. The researchers believe that estrogen may protect against hypertension.

"Collectively, the study suggests that pediatricians caring for adolescents and physicians caring for young adults should be more aware of the need to monitor weight and blood pressure even when they are considered "normal," explains Dr. Iris Shai, an associate professor in the Department of Epidemiology in the Faculty of Health and Sciences. "For the individual person, a 'normal value' may still be associated with a significant elevated risk of disease when the BMI and sex of the patient is also considered."

Once again, a "healthy" BMI is the way to go.