I don’t know the science behind it, but I think that’s normal as your palate adjusts to the sweetness. For me, it’s usually the other way around: I usually feel like the first few sips are fine, but as I drink the soda, it gets progressively sweeter for me up until a point where it gets too sweet for me quite often.

This is normal. It’s also why, if you drink lots of sugary drinks, things like unsweetened tea or sparkling water (without sugar) become flavorless until you cut out the sugary drinks for a few weeks. Only after that will you begin to taste the natural flavors.

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