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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Lemon peel - Lemon peels actually offer great nutritional benefits, including fiber and vitamin C, as well as other essential vitamins and minerals.
Kiwi skin - Who knew that hairy skin was edible? 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.
Avocado pits - Avocado pits can reportedly be ground into a flour by baking until soft, removing the husk, and blending the pit. The flour can then be used in smoothies and baking.
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.
Cucumber skin - Save yourself the extra work and gain some added nutrition by leaving the cucumber peel on. If you don't like the taste, add it to smoothies or finely chop into salads.
Corn husks - Don’t toss those corn husks either! Instead, dry them out in the sun to make the perfect wrapping for tamales.
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.
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.
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.