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Smoking, Diabetes, Obesity May Shrink Your Brain
Date:8/1/2011

ore rapid increase of small areas of vascular brain damage.

Meanwhile, participants who were obese at middle age were more likely to be in the top 25 percent of those with faster declines in tests of executive function, DeCarli said. Those with a high waist-to-hip ratio were more likely to be among the 25 percent with a faster drop in brain volume.

"I do think it's an important study and has practical importance in confirming there are things we can do in middle age that can have effects 10, 20 and 30 years down the line to improve cognitive health," said Dr. Raj Shah, medical director of the Rush Memory Clinic in Chicago. "It may seem we're talking about things that are somewhat common knowledge, but really, we always hypothesize these things could happen, but to show they actually do in a study is very important."

DeCarli noted that the effects of the risk factors studied are likely to be even more compelling in the general population, since study participants were largely healthy individuals with normal blood pressure and cholesterol levels and a low diabetes rate.

"It could be so much worse in a representative group of Americans," he said, adding that all study participants were white and only 5 percent were diabetics, compared to a nearly 50 percent rate for Hispanics over age 65. And, "the study certainly doesn't represent the growing obesity problem seen in the South."

One of the strengths of the research was that it used a large sample of people from a well-known study, said Catherine Roe, an assistant professor of neurology at Washington University School of Medicine in St. Louis. However, the results don't prove these risk factors caused the brain changes, she added.

"We know smoking and being overweight are bad for other parts of your health," Roe said. "This is just one more reason to get these things under control."

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