Having normal blood sugar levels is no guarantee against developing type 2 diabetes down the road, according to Italian researchers.

In fact, they report in the journal Diabetes Care, people at the high end of what's considered the normal blood sugar range are twice as likely to get the disease as those in the low end.

But does that mean doctors should treat these people any differently, as researchers suggest? Not at all, says one expert who wasn't involved in the new work.

"Th e concern here is that people get started on medications at a level below the conventional threshold for diabetes," says Dr Michael LeFevre, a family physician at the University of Missouri in Columbia.

"My personal recommendation is that people should strive to manage their weight and be physically active irrespective of what their blood (sugar) level is," he adds.

Type 2 diabetes is a lifestyle disease in which the body no longer responds appropriately to the hormone insulin, which helps ferry sugar from the blood into our cells aft er a meal.

When fasting blood sugar levels reach 126 milligrams or more per deciliter, doctors will diagnose diabetes, because too much sugar in the blood will cause severe damage to the heart, kidneys and other organs over time.

Traditionally, blood sugar levels below 100 milligrams per deciliter have been considered safe, whereas levels between 100 and 126 signal a higher risk of diabetes - termed prediabetes.

But according to the new study, by Dr Paolo Brambilla and colleagues at the University Milano Bicocca in Italy, the currently accepted "normal" blood sugar range might be too wide.

Th e researchers looked at data for nearly 14,000 men and women who had blood drawn several times at their clinic. All of the patients had normal blood sugar levels at fi rst. Over the next seven to eight years, on average, about 2 percent of the women and nearly 3 percent of the men developed diabetes.

Less than 1 percent of those who started out with fasting blood sugar levels between 51 and 82 milligrams per deciliter wound up with the disease, while more than 3 percent did so if they had values between 91 and 99.

Th e fi ndings are in line with an earlier study from Oregon, and the Italian researchers say they can help identify the people who need extra medical attention.

But LeFevre says he was concerned about the label "prediabetes" - let alone expanding it downward into lower blood sugar ranges.

"We don't know that there is a magic threshold" for blood sugar, he says. "As the blood sugar goes up, the risk of complications increases."

Unless you're diabetic, he says, the best thing to do is to eat a healthy diet and get lots of exercise. And that goes for people with low blood sugar as well.

"I would be very concerned if people with low (blood sugar) levels would allow themselves to be sedentary and overweight as a result of these fi ndings," LeFevre says.

Reuters