Whether you sneak them into a smoothie or serve them in a salad, leafy greens boast loads of benefits. As well as playing a key role in helping blood to clot, Leafy vegetables are critical in preventing certain age-related conditions. Leafy vegetables are a good source of Carotenoids Lutein and Zeaxanthin, which help filter high-energy light that may cause eye damage. The slightly bitter taste of many leafy greens is a good sign: It reflects their high levels of Calcium which is very healthy. Intake of leafy vegetables also decreases the risk of Cancer.