I’ve heard people say it is because of a brain signal but I’m not sure.
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Sugar has calories. You can fill yourself up with sweet stuff, and your body can process it – the negative consequences are mostly long-term. Sugar is kinda rare in nature, so a sugar addiction is self-limiting in a world without modern transport logistics.
Salt is not fuel. Your body needs to top off sometimes, but it doesn’t burn salt the way it burns sugar. If you binge eat salt, you will probably die in the next day or so. Additionally, salt can (sometimes) be very common – there are literal oceans of the stuff just lying around and an addict would not have a chance to survive and pass on their genes.
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