system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do artificial flavors like Apple, Cherry, Banana, etc taste exactly like real Apples, Cherries, Bananas, etc but Grape flavored anything just tastes like the color Purple instead of real Grapes.
gpt
They taste like Concord grapes, the purple-colored grapes that are commonly used to make grape jam and grape juice.

Green and red grapes that you typically find in a supermarket are juicier and sweeter, so they're better for eating as-is, but they taste very different than Concord grapes.

Also, I'd argue that artificial fruit flavors don't taste "exactly" like real fruits, but they are reminiscent. Artificial grape is certainly no worse in that regard.