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

Finally, something that feels good is actually good for you too. I've written about the benefits of laughter before, but scientists have recently discovered another reason to giggle more often.

In a study of 32 healthy men, researchers at Loma Linda University and Oakcrest Health Research Institute in Yucaipa, CA found that those who were exposed to something funny - like a comedic video - had 27 percent more beta-endorphins and 87 percent more human growth hormone in their blood. But here's the really good news: this hormonal increase was present even before the funny program began and it remained elevated even after the video was over.

Go on, laugh away, it's good for you. It sounds silly, but laughter is gaining momentum as a valued alternative therapy. Studies into the benefits of laughter on health and