Vitamin water and most sports drinks that are promoted by leading sports people are setting kids up for rotten teeth, obesity and diabetes - all in the name of improving health and sports performance! This devious marketing tactic reminds me of the tobacco industry around 1990 when it once sponsored sports such as triathlon and duathlon.
Chronic high sugar intake is detrimental to sports performance because it sets the athlete up for bouts of hypoglycaemia, or sugar crashes.
By the way, fructose is not bad for you when taken in moderation and in balance with other sugars and natural solids - such as in whole fruit. The problem with fructose nowadays is we can get far too much on its own if consuming processed foods, including sugar drinks with nothing else with it other than a few token vitamins and a good dose of toxic colouring agents.