> But the real number is actually six, because we have two separate salt-taste systems. One of them detects the attractive, relatively low levels of salt that make potato chips taste delicious. The other one registers high levels of salt—enough to make overly salted food offensive and deter overconsumption.

I can imagine a future scenario where, in the interests of public health, someone figures out how to transliterate the 'too much salt' genes to 'too much sugar' genes.

Of the various ways that I could see human augmentation play out for the better rather than the worse, I'd rank that right behind tetrachromacy and hypoxia genes (particularly for Martians and Lunatics)