Roni Caryn Rabin New York Times

A wide-ranging study of Americans' sexual behavior, based on the largest nationally representative survey since 1992, finds that condom use is becoming the norm for sexually active teenagers.Indeed, they are more responsible than adults about using condoms, the researchers report in a study coming out on Monday. A vast majority of sexually active 1...

One of the longest trials to pit low-fat diets against Atkins-style diets found that participants lost the same amount of weight after two years, regardless of which diet they were on, though the Atkins dieters had greater increases in HDL, or "good" cholesterol. Previous studies have shown mixed results.The clinical trial randomly assigned 307 obe...

A wide-ranging study of Americans' sexual behavior, based on the largest nationally representative survey since 1992, finds that condom use is becoming the norm for sexually active teenagers.Indeed, they are more responsible than adults about using condoms, the researchers report in a study coming out on Monday. A vast majority of sexually active 1...

One of the longest trials to pit low-fat diets against Atkins-style diets found that participants lost the same amount of weight after two years, regardless of which diet they were on, though the Atkins dieters had greater increases in HDL, or "good" cholesterol. Previous studies have shown mixed results.The clinical trial randomly assigned 307 obe...