Volunteer. A study from Vanderbilt University found that people of all ages who volunteered were happier and experienced better physical health and less depression than those who didn't give their time. Find volunteer opportunities at Volunteermatch.org.
Exercise. A study from Oregon Health & Sciences University in Portland reported that a seven-week aerobic exercise program reduced depression symptoms more than stretching. Researchers believe exercise could create a mood-boosting effect similar to certain depression-fighting medications.
Eat fish. Research suggests that the omega-3 fatty acids found in fish such as herring, mackerel and salmon, and in flaxseeds and walnuts, may lower risk of seasonal affective disorder and mild depression.