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10.Lettuce
Image source: Pixabay.com
Whatever variety takes your fancy – romaine, iceberg, summer crisp – lettuce leaves are an excellent source of Vitamin K and Vitamin A. They also contain iron and folate. 100 grams, or 3.5 ounces, is around 15 kilocalories. That’s the equivalent of about 5 calories per cup, so you can eat a lot of lettuce without consuming very many calories!