Selective breeding

Wild peaches were only 25mm long with a flesh-to-pit ratio of just 3:2—essentially an almond with a thin layer of flesh. Peaches and almonds are very closely related species, and if you look closely at a peach pit, you can see it resembles an almond.

Corn's ancestor is teosinte, a plant resembling foxtail grass with almost nothing edible. Humans spent centuries on selective breeding, picking the best mutations, to create modern corn. Today, a single corn kernel has more nutrition than an entire ear of ancient teosinte.