An Evidence-Based Assessment of Federal Guidelines for Overweight and Obesity as They Apply to Elderly Persons

Asefeh Heiat, Viola Vaccarino, Harlan M. Krumholz
2001 Archives of Internal Medicine  
The US Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults set the body mass index (BMI; weight in kilograms divided by the square of height in meters) of 25 as the upper limit of ideal weight for all adults regardless of age. However, the prognostic importance of overweight and obesity in elderly persons (Ն65 years) is controversial. We sought to analyze the guidelines in the context of currently available evidence that is relevant to older
more » ... dults. Methods: We searched MEDLINE for all Englishlanguage studies of the association between BMI and all-cause or cardiovascular mortality or coronary heart disease events from January 1966 through October 1999. Additional pertinent articles were identified through bibliographies of the MEDLINE articles. We selected studies for detailed review if they reported on the association between BMI and mortality for nonhospitalized subjects who were 65 years or older and had been followed up for at least 3 years. We controlled for age, smoking, and baseline health status. Of the 444 screened articles, 13 were selected to assess the guidelines. We extracted information regarding publication year, study design, population, recruitment period, follow-up duration, number of subjects, sex, age range, inclusion and exclusion crite-ria, and statistical models, including variables and end points. Results: These data do not support the BMI range of 25 to 27 as a risk factor for all-cause and cardiovascular mortality among elderly persons. The results were not substantially different for men and women. Most studies showed a negative or no association between BMI and all-cause mortality. Three studies indicated overweight (BMI Ն27) as a significant prognostic factor for allcause and cardiovascular mortality among 65-to 74year-olds, and one study showed a significant positive association between overweight (BMI Ն28) and allcause mortality among those 75 years or older. Higher BMI values were consistent with a smaller relative mortality risk in elderly persons compared with young and middle-aged populations. Conclusions: Federal guideline standards for ideal weight (BMI 18.7 to Ͻ25) may be overly restrictive as they apply to the elderly. Studies do not support overweight, as opposed to obesity, as conferring an excess mortality risk. Future guidelines should consider the evidence for specific age groups when establishing standards for healthy weight.
doi:10.1001/archinte.161.9.1194 pmid:11343442 fatcat:rqrsvw3t2jeh5lb4wi6zrc736i