I’ve heard people say it is because of a brain signal but I’m not sure.
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Our bodies run on sugar (glucose). We are evolutionarily programmed to seek out sugary foods, since they are a good source of energy. The problem is that sugary foods are overly abundant in the modern diet, it’s too easy to consume a lot of it in a small amount of time. A hundred thousand years ago fruit was much rarer, and was only available when it was in season. Humans didn’t start eating grains regularly until about 20,000 years ago. Salt is important for a lot of bodily processes, but it isn’t a source of energy so we aren’t programmed to seek it out as much.
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