The latest news about chocolate -- that it makes blood vessels more flexible -- adds to accumulating evidence that chocolate offers a number of health benefits and may be good for the heart. Earlier findings had shown that chocolate contains polyphenols, the same kinds of antioxidants found in red wine and green tea; stearic acid, a type of fat that doesn't raise cholesterol levels; and flavonoids, which reduce the stickiness of platelets, inhibiting blood clotting and reducing the danger of coronary artery blockages.