Impulse buying may actually be a good thing today. Tired of spinach and arugula? You may instinctively grab a bunch of kale to have as a dinner side dish. Good for you! Kale is loaded with beta carotene, iron and folate, and it's also a low-calorie source of protein and fiber. Whether steamed or sauteed with garlic, you'll see first hand why kale earns its reputation as a superfood.