Experiencing less pleasure from a previously liked food after consuming something sweeter or more savory is due to a shift in dopamine levels, which can be blocked by preventing dopamine shifts.

“If you ingest something that you like, it tastes good to you, but then you ingest something that's even sweeter or even more savory, and then you go back to the food that you ate previously, well, you don't like it as much. And that might seem like a duh, obviously, but that shift in perception can be blocked by blocking the shift in dopamine.”