March 7, 2019
There is finally some good news for the 40% of Americans who are considered to be overweight. Having some extra body fat may be linked to an increased chance of surviving a stroke, based on preliminary findings of a UCLA study, Medical Xpress reports.
Released on March 4, the research data is scheduled to be presented at the American Academy of Neurology’s 71st Annual Meeting in Philadelphia, May 4 to 10.
Medical experts call this advantage “the obesity paradox,” according to Medical Xpress. Indeed, healthcare professionals believe that obesity may be protective for some people, such as the aged or those with certain chronic diseases.
“It was first noticed that carrying extra weight may play a role in survival for people who had suffered from kidney or heart disease, so we felt the need to investigate whether it also was tied to improved stroke survival,” said study author Zuolu Liu, MD, of UCLA and a member of the American Academy of Neurology.
The study looked at 1,033 people at an average age of 71 who had suffered an acute ischemic stroke, which is a stroke that cuts off blood supply to part of the brain.
Researchers calculated participants’ body mass index (BMI—a measure of a person’s body size based on their height and weight. People are considered overweight if they have a BMI of 25 to 29; and obese, with a BMI above 29. The average BMI for the participants was 27.5.
Participants then were divided into five categories, based on their BMI: underweight, normal, overweight, obese, and severely obese.
Researchers then monitored patients for three months following their strokes, measuring their levels of disability.
The study found that people who were severely obese were 62% less likely to die than people of normal weight. People who were obese were 46% less likely to die after a stroke and those who were overweight were 15% less likely to die. Conversely, people who were underweight were 67% more likely to die after a stroke than people of normal weight. (These results were calculated after researchers adjusted for other factors that could affect survival rates, such as having high blood pressure, having high cholesterol, or habitually smoking.)
Of the 95 people who were severely obese, 11 died during the study, compared to 19 of the 192 people who were obese, 58 of the 395 people who were overweight, 55 of the 327 people who were normal weight, and six of the 24 people who were underweight.
“One possible explanation is that people who are overweight or obese may have a nutritional reserve that may help them survive during prolonged illness,” stated Liu. “More research is needed to investigate the relationship between body mass index and stroke.”
The researcher cautioned that one limitation of the study was that all participants were from southern California, which means results may not be the same for other populations. However, the racial/ethnic distribution of the population in this study mirrors that of the national population.
Research contact: @AANMember