“How you perceive [sweet] may influence what you like in the extreme, but it’s more like shades of gray,” says Danielle Reed at the Monell Chemical Senses Center. “And we still need to see whether this has any implications for people’s food behavior.”
I think it definitely affects people’s food choices. After all, if a person has a low sweetness threshold, they will choose things that are less sweet, because they cannot tolerate things that taste too sweet to them.
Anecdotally, I think it is possible to “turn down” your sweetness threshold. After my spouse and I removed a lot of the sugary drinks and foods we used to enjoy from our diet out of a concern for our future health, I have found that some things like very sugary donuts are just not as enjoyable to me as they once were. They’re just too sweet for me now.