Researchers are exploring the effects of diet, exercise, age, psychological stress and other factors on the immune response. However, following practical healthy-living guidelines can help your entire body, including the immune system, function better. For example, regular exercise promotes good blood circulation. This helps immune system elements move freely through the body and do their job efficiently.

Other ways to strengthen your immunity:

• If you smoke, quit.
• If your diet is low in fruits, vegetables, legumes and whole grains, consider taking a daily multivitamin and mineral supplement.
• If you drink alcohol, do not exceed moderate levels.
• Maintain a healthy weight.
• Maintain a healthy blood pressure.
• Get 7 to 9 hours of sleep daily.

— Diane McReynolds, Founder, Personal Best Healthlines