More than half of US diabetics have arthritis

More than half of U.S. adults with diabetes also have arthritis, raising a serious obstacle for diabetic patients urged to exercise, according to a government study.

The survey of nearly 800,000 people is the first extensive look at the overlap between the two conditions, said Dr. John Klippel, president of the Arthritis Foundation.

And its findings highlight a significant challenge: Most diabetics are told exercise is important to their health, but experts say many of them don't do it.

People with diabetes who exercise have better control of their blood sugar and a much lower risk of heart disease complications. But the new research suggests many diabetics see themselves as unable to exercise because of arthritis, said Julia Simard, a Harvard School of Public Health researcher who has studied rheumatoid arthritis and diabetes.

"If you have this perception of ill health, it may affect your willingness to be active," said Simard, who was not involved in the new research.

More than 46 million Americans have some form of arthritis, and nearly 21 million have diabetes. Other research indicates exercise is important in managing both conditions.