The Centers for Disease Control and Prevention says many doctors aren't advising their obese patients to lose weight. The CDC says only about 40 percent of doctors told their obese patients to lose weight in 2000, down about three percent from 1994. The government also says patients who were advised to lose weight were nearly three times more likely to drop the excess pounds than those who weren't given such advice. About 30 percent of all U-S adults are obese, which puts them at greater risk for diabetes, stroke, high blood pressure, heart disease and certain cancers. Some doctors say they're not confident counseling their patients to lose weight because they don't have enough formal training about obesity.