Leafy green vegetables such as kale, spinach, Swiss chard, and bok choy are high in vitamins, minerals, and fiber. Adding a variety of greens to your diet may help boost brain health and lower your risk of heart disease, cancer, and high blood pressure. Leafy green vegetables are an important part of a healthy diet. They’re packed with vitamins, minerals and fiber but low in calories.Eating a diet rich in leafy greens can offer numerous health benefits including reduced risk of obesity, heart disease, high blood pressure and mental decline.