Banana peels - You've probably been throwing away banana peels all your life, and with that you've tossed out so much tryptophan, which boosts serotonin.
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Kiwi skin - It's also really good for you, with vitamin C and fiber. If you can't get past the fuzz, try adding a whole kiwi to a smoothie.
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Lemon peel - Lemon peels actually offer great nutritional benefits, including fiber and vitamin C, as well as other essential vitamins and minerals.
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Celery leaves - Sometimes removed before they even hit the stores, celery leaves are treated unjustly for how rich they are in magnesium, calcium, and vitamin C.
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Swiss chard stems - Swiss chard stems are high in glutamine, meaning they can improve your immune system, and they're also high in iron and fiber.
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Avocado pits - Avocado pits can reportedly be ground into a flour by baking until soft, removing the husk, and blending the pit.
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Carrot tops-The green stems and leaves at the top of a carrot are perfectly safe to eat! They have a slightly bitter taste, but work well as garnish or boiled in soup stock.
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Pumpkin and squash seeds- Squash season sees a painful waste of nutritious seeds, which should always be roasted with various spices or even just salt for a delicious snack.
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Pickle juice - The remaining pickle brine can actually be used to pickle other things. It also adds a nice tang to salad dressings and drinks like martinis or Bloody Marys.
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Bacon grease - Bacon isn't exactly an environmentally-friendly food, so the least you could do is save the grease for even more use.
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Outer cabbage leaves - Many people tend to throw away the outer cabbage leaves, but they're still a powerful source of vitamins A, C, and B.