Foods that you should never, ever reheat

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Oils

Some oils, such as grapeseed, walnut, avocado, hazelnut, flaxseed, etc., have very low smoke points after they've been made through various cooking processes. Once they hit that point, they become rancid and start emitting toxic smoke. It's best to avoid cooking with these oils altogether and instead drizzle them onto your dishes at the end for more taste and texture.