Here’s a good answer from SE: https://biology.stackexchange.com/questions/56476/why-are-so-few-foods-blue https://biology.stackexchange.com/questions/56476/why-

Here’s a good answer from SE: https://biology.stackexchange.com/questions/56476/why-are-so-few-foods-blue https://biology.stackexchange.com/questions/56476/why-are-so... (spoiler: we don’t know). But the second answer speculates that blue light was the most available to the ancestors of current plants (due to properties of Earth’s atmosphere) so they evolved to absorb it. Related question is why plants are green: https://biology.stackexchange.com/questions/450/why-do-plants-have-green-leaves-and-not-red https://biology.stackexchange.com/questions/450/why-do-plant...