Today\'s teenagers have more risk factors for cardiovascular disease than did teens of earlier decades, largely because excess weight is fueling an increase in prediabetes and diabetes, a national survey showed. Data from among nearly 4,000 teenagers from the National Health and Nutrition Examination Survey (NHANES) showed that 34% were overweight or obese, a number largely unchanged over a decade, but those considered prediabetic or diabetic more than doubled to 23% (P