A weak immune system can be caused by a variety of things, including high stress levels, diseases like AIDS, HIV and cancer, exposure to lots of germs and excess alcohol intake. Avoid situations that weaken the immune system with healthy advice from a registered and licensed dietitian in this free video on nutrition.
Expert: Christine Marquette
Bio: Christine E. Marquette is a registered and licensed dietitian with the Austin Regional Clinic in Austin, Texas.
Filmmaker: Todd Green