Laughter helps reduce stress and boosts your immunity, so yuk it up.

Laughing decreases stress hormones in your body and amps up natural killer T cells that go to bat against virus-infected and malignant cells, a study revealed. Watching a funny movie, giggling with a friend, or attending a comedy act are great ways to keep your immune system strong.

Laughter isn't only beneficial for your psychological state; it's good for your body, too. Laughter promotes feelings of well-being by reducing the amount of stress hormones in the body such as epinephrine and cortisol. Results from a new study suggest that laughter increases both the number and the activity of natural killer T cells, cells that act as the first line of defense against viral attack and damaged cells. Regular exercise, meditating, and journaling can all help you feel relaxed as well, which in turn benefits your immune system.

RealAge Benefit: Laughing often can make your RealAge up to 8 years younger.

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