I would argue that it is more than just some who are able to reduce hypertension as a result of losing fat. One thing you have to remember in these studies that cite BMI, it isn't an accurate measure of obesity. A 240 lb linebacker is often obese by the BMI measure. A better measure is body fat percentage. Reducing body fat will increase your health on so many levels.
Some who reduce weight reduce hypertension
TUCSON (UPI) -- Researchers in Italy found that as many as 50 percent of overweight, hypertensive adults, may have hypertension as a result of being overweight. Study leader Dr. Roberto Fogari of the University of Pavia, in Italy, said the findings apply only to overweight patients, not to obese patients, with high blood pressure -- defined as systolic pressure of 140 mm Hg or higher or a diastolic pressure of 90 mm Hg or higher. The study analyzed 210 overweight men and women -- ages 29 to 65 -- whose systolic blood pressure was more than 140 mmHg, but less than 159 mm Hg, and diastolic blood pressure more than 90 mm Hg, but less than 99 mm Hg. The study patients were overweight with a body mass index 25 to 29.9. An individualized reduced-calorie diet was designed for each patient and when diet alone did not achieve the appropriate body weight reduction, the weight-loss drug Orlistat was given. After six months, 49 percent of women and 53 percent of men achieved body weight reduction of more than 5 percent weight loss and a mean reduction in systolic and diastolic blood pressure of about 5 percent. The researchers presented the findings at the American Heart Association's 61st annual fall conference of the Council for High Blood Pressure Research in Tucson, Ariz. Copyright 2007 by United Press International