system
Given the following post, respond as if you're commenting on Reddit:
human
Why are there no "natural" artificial sweeteners?

So, part of why fruits are so delicious is because plants want animals to eat them in order to spread seeds around.  But what's the advantage to also being nutritious?  Wouldn't it make sense to start making some kind of sweetener that binds tightly to taste receptors to be the tastiest fruit to eat?  Maybe this actually does exist.  Thanks!
gpt
There is actually such a thing; it's a glycoprotein called miraculin.  It is found in a tropical fruit known popularly as the miracle berry.  You may have heard of it in the context of something called flavor tripping.  The protein binds semi reversibly to sweet receptors and is triggered by an acidic environment.  Acid is way cheaper for an organism to produce than sugar.  One likely reason we are so good at detecting artificial sweeteners is that if we get fooled by such a strategy, we get cheated out of calories needed for survival.