If your children are overweight or obese, their risk of having high blood pressure is almost three times higher than children at normal weight, according to new research in Hypertension: Journal of the American Heart Association. A study of 1,111 healthy Indiana school children over a period of 4.5 years revealed that when the children’s body mass index (BMI) reached or passed the 85th percentile — the beginning of the overweight category — the adiposity effect on blood pressure was more than four times that of normal weight children. Adiposity is fat under the skin and surrounding major organs.