Four Tips to a Healthy Immune System

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Your immune system is your interface with the environment. A healthy immune system is the cornerstone of good health - it allows you to come in contact with germs, allergens and carcinogens, helping to avoid infections, allergic reactions and cancer.

Immune deficiency can be avoided with preventive measures:
Maintain good oral hygiene (gum infections can use up a lot of the body's immune resources).
Use antibiotics only when absolutely necessary and avoid immunosuppressive drugs unless there are no other alternatives left to consider.
Cut back on sugar and stop eating polyunsaturated vegetable oils and artificially hardened fats - instead use olive oil and eat fresh fruits when craving something sweet.
Don't forget moderate exercise - it can raise the level of your body's natural killer cells.

...from Dr. Weil website