I’ve heard people say it is because of a brain signal but I’m not sure.
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Encountering too much salt is a thing that is not uncommon in the wild. Even on land salt is often present in large deposits and an organism could easily consume too much. So evolving mechanisms to know not to take too much salt at a time was important.
That is just not nearly as big an issue in the wild when it comes to sugar. Very rarely are we going to have more than we can process. And even if we do in the short term that almost certainly will not last in the long term. So there was much less reason to evolve a mechanism to limit the amount of sugar we consume.
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