"Soft drinks and sugar-containing beverages are the low hanging fruit in public health today, " says Dr. David Ludwig, director of the New Balance Foundation Obesity Prevention Center, at Children's Hospital in Boston.

CNN: Soft drinks: Public enemy No.1 in obesity fight?

When people drink too many beverages containing added sugar, such as soft drinks, fruit drinks, energy or sports beverages, they tend to put on weight.

CNN: Sugary drinks linked to 180,000 deaths worldwide