The largest U.S. doctors' group wants a ban on marketing energy drinks to youths under 18. The American Medical Association, representing 225,000 physicians, says studies link the drinks – such as Rockstar, Monster and Red Bull -- to heart problems and emergency room visits by young consumers. The drinks often are marketed at youth sports tournaments and broadcasts of extreme competitions aimed at young people.

The recommendation is just that, with no direct impact. Any ad ban depends on a federal agency, such as the Food and Drug Administration, or a voluntary move by companies. Other countries have acted. Denmark, Turkey and Uruguay ban these drinks for adults or teens. Norway prohibits sales to children under 15.

In this country, a report last year in the main journal for pediatricians said they should discuss the risks of energy drinks with young patients, especially those with heart conditions and mood or behavioral disorders. In Washington, Congress members have called for more clarity on the drinks’ ingredients and health effects.

Doctor says: "Energy drinks contain massive and excessive amounts of caffeine that may lead to a host of health problems in young people, including heart problems. Banning companies from marketing these products to adolescents is a common sense action that we can take to protect the health of American kids." – Dr. Alexander Ding, AMA board member from Boston

Industry representative says: "Leading energy drink companies voluntarily display total caffeine amounts -- from all sources -- on their packages, as well as an advisory statement indicating that the product is not intended or recommended for children." – Maureen Beach, American Beverage Association

Nutrition expert says: "Most of the energy drinks contain high-tech sounding ingredients that are not controlled substances, of no value and are potentially harmful in large amounts." -- Cynthia Sass, New York City sports nutrition specialist