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Examples I hadn't thought about: root vegetables (carrots, potatoes, etc.) are storage organs, optimized for storing carbs (kinda like livers). Underground to make them harder to eat.
Speculative: among animals, predators might actually be more edible than prey, overall. Prey have more incentives to be less edible (leads to shells, poison, etc), and predators don't have to worry as much about this.
Confusing (to me): grains (wheat, rice, corn, etc). Glancing at the Wikipedia articles, their wild ancestors spread by wind. So not optimized to be eaten! (Although still seeds / fruits.) Then why so dominant as food crops? Do they just grow fast or something?
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