Is laughter really the best medicine?  Dr. Weil reveals all the good a guffaw can do for your health, mood and immune system.

Forget massage, running, even yoga. The most relaxing fun your body can have without sex is laughing. A recent study at The University of Maryland Medical Center found laughter helps blood vessels function better. It’s also known to enhance the immune system, reduce stress, and ease aches and pains. And you can (carefully) count it toward your (slightly fading?) resolution to stay/get in shape (the website of Laughter Clubs International shows a cartoon with one person saying, “You look great! Working out?” and the other responding, “No, laughing out loud!” Ouch. But you get the idea).