A functional beverage is a conventional liquid food marketed to highlight specific product ingredients or supposed health effects.
[1][2] Most of these drinks contain significant amounts of sugars and hence calories, which would add to discretionary and total caloric intake.
As such, these ingredients pose health risks because of what they contain (sugar and caffeine) or what they replace in the diet (vitamin and mineral-rich foods).
Both convenience and health have been identified as important factors in consumers' decision-making about food and beverage purchases.
Various ingredients found in energy drinks may include taurine, caffeine, B vitamins, guarana, ginseng, ginkgo biloba, L-carnitine, sugars, yerba maté, and creatine.