Researchers at Sydney University surveyed more than 3000 teenagers and found energy and diet sodas were causing the most damage.
The study found about 30 per cent of teenagers who drank at least a cup of sugary drinks a day were overweight or obese.
But those consuming energy and sports drinks, or flavoured water, were even more likely to be overweight.
Almost 20 percent of teens in the study drank energy drinks.
The study says all sweetened beverages are linked to oral health problems.
