A bitter taste generally signals the presence of a toxin

Although bitter has over 40 different receptors on the human tongue, “sweet” only has one. Being able to detect a greater range of  bitter is evolutionarily advantageous because bitter usually signifies potential toxin.   Umami The TAS1R1+TAS1R3 heterodimer receptor functions as the umami (savory) receptor, responding to L-amino acid binding, especially L-glutamate.[8] The umami taste […]