Saturday, August 13, 2011
ScienceDaily (Aug. 11, 2011) — While some past studies have shown that persons carrying a few extra pounds in their 70s live longer than their thinner counterparts, a new study that measured subjects' weight at multiple points over a longer period of time reveals the opposite.
Research from Adventist Health Studies recently published in the Journal of the American Geriatrics Society showed that men over 75 with a body mass index (BMI) greater than 22.3 had a 3.7-year shorter life expectancy, and women over 75 with a BMI greater than 27.4 had a 2.1-year shorter life expectancy. Generally, a BMI between 18.5 and 24.9 is considered normal weight, and a BMI of 25 to 29.9 is considered overweight. A BMI of 30 or more is considered obese.
Previous work in this area by others found a protective association for a high body weight among the elderly. Pramil N. Singh, DrPH, lead author of the paper and an associate professor in the School of Public Health at Loma Linda University, says the data from many past studies is problematic because only a single baseline measure of weight was taken, which does not account for weight changes or how weight changes affect life expectancy. Additionally, most past studies had mortality surveillance of fewer than 19 years, which analyses have shown to be an inadequate amount of time to study risks associated with weight.