Super-tasters are persons that have advanced taste buds that allow them to experience taste at a higher quality. These advanced taste buds are a genetic mutation; though no one knows the cause of the mutation. People who are super-tasters are more than likely picky eaters; one example of that is a woman, Amber, refused to eat anything but french fries. Even then, the french fries had to be a certain size and cooked a certain way. She had no idea she classified as a super-taster until she got her DNA tested in her mid-thirties.
Super-tasters often prefer blander foods because their taster receptors are so sensitive. That doesn't mean they don't enjoy eating, they just avoid things like carbonated drinks, bitter foods, and citruses. Super-tasters live a normal life, they act no differently than a person with a food allergy.