Earlier diabetes tests advised

Overweight and obese Americans should start getting screened for diabetes earlier, at age 35 instead of 40, according to updated national guidelines published Tuesday.

The new advice stems from rising rates of both obesity and Type 2 diabetes, and research showing health benefits of prevention methods and early treatment. Three out of 4 U.S. adults are overweight or obese, which increases their chances for developing diabetes.

Among adults age 18 and older, 14% already have diagnosed diabetes, and 33% have prediabetes. Screening is recommended up to age 70.

The guidance from the U.S. Preventive Services Task Force, an advisory group to the U.S. government, was published online in the Journal of the American Medical Association. It updates the task force's 2015 recommendations, and says even earlier screening should be considered for overweight or obese American Indians, Black people, Hispanics and other groups with disproportionately high diabetes rates.

The American Diabetes Association says overweight or obese adults of any age should be screened.

Screening means blood tests to measure sugar levels and sometimes involves drinking a sugary liquid first. The new guidance suggests that people whose tests are normal could be screened every three years.

Type 2 diabetes impairs the body's ability to use insulin to regulate blood sugar, leading to high levels that can cause heart problems, organ damage and blindness. Prediabetes means higher than normal blood sugar levels that can lead to full-blown diabetes.

Type 2 diabetes incidence has increased in recent years along with obesity rates. A 2001-17 report in the same journal shows the rate nearly doubled in kids age 10-19, jumping from 34 cases per 100,000 kids to 67 per 100,000.