In addition to hunting animals for food, as described on the Controls & Gameplay Tips page, there are also vegetarian options on the island.
Food caches are small, orange boxes or coolers that yield Experience Points when opened. To do so, just stand close and press Interact.
Some areas also contain edible plants that can be picked for a small number of XP, also using the Interact button. I'm not sure what these are, but they look a bit like persimmons.
[Collectibles | Controls & Gameplay Tips]
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