I've occasionally wondered what food would taste like if you could selectively (and temporarily) disable the sweet taste-buds on your tongue. Same with salt taste-buds.
Perhaps numbing your tongue would work? A dentist could do that, but you'd only want to numb the surface. Is white coke (the illegal kind) a topical anesthetic?
There are "miracle berries" that make sour foods taste sweet.
It'd be fascinating to try something that took the sweet out of sodas. Someone posted a link to the OpenCola project in this thread. It's probably possible to make a batch with no, or much less, sugar than regular coke.
Perhaps numbing your tongue would work? A dentist could do that, but you'd only want to numb the surface. Is white coke (the illegal kind) a topical anesthetic?