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4.Popcorn
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Image source: Purelyunrefined.com
When air-popped, popcorn kernels are an extremely healthy snack! This is because popcorn is a good source of dietary fiber, protein, iron, and Vitamins B2 and B1. One cup (around 8 grams) popped without any added fats, salt or sugar is approximately 45 kilocalories.