Andrew Huberman· PhD
Sweet to ensure that we get the right amount of energy, umami, to ensure that we get proteins and that essential nutrient, salt, the three appetitive ones to ensure that we maintain our electrolyte balance, bitter to prevent the ingestion of toxic nauseous chemicals, nearly all bitter tasting things out in the wild are bad for you, and sour, most likely to prevent ingestion of spoil acid, fermented foods.