[klipt]

Probably more useful than the naked eye in many cases. The colors our eyes can see mostly evolved to detect ripe fruit, not diseased tissue.

[lurquer]

Why did fruit evolve to change colors when ripe?

[ttsda]

In many cases so animals would eat them, digest the seeds, and poop them out somewhere else.

[lurquer]

Why did animals evolve an attraction to ripe-colored fruit?

[thaumasiotes]

On the contrary, finding edible food is certainly important, but avoiding poisonous/diseased food is even more important.

[DEADBEEFC0FFEE]

If we can detect ripe, surely we can infer not ripe.

[infectoid]

There's probably an app for that.