Leaf vegetables have very low calorie count, no fat content to speak of, a lot of dietary fibre, iron and calcium, and are very high in phytochemicals such as vitamin C, carotenoids, lutein, foliate and vitamin K. This means they improve bowel movement, reduce cancer risk and have such low carbohydrate content that they are virtually carb-free. Lettuce, broccoli, spinach, sprouts, cucumbers and about a 1000 more plants have edible leaves so you really are spoilt for choice. Also there are innumerable ways to consume greens: raw salads, as a cooked meal, stews, soup, etc. Also Read - Sleep as an Escape: Why you sleep more when life feels overwhelming