Athletes who overtrain may put excessive stress on their bodies and become more susceptible to respiratory infections, but the fiber found in nutritional and brewer's yeast may prevent this immune decline in marathon runners.

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More on the benefits of exercise in:

• Exercise & Breast Cancer (http://nutritionfacts.org/video/exercise-breast-cancer/)
• Reversing Cognitive Decline (http://nutritionfacts.org/video/reversing-cognitive-decline/)
• What Women Should Eat to Live Longer (http://nutritionfacts.org/video/what-women-should-eat-to-live-longer/)
• Is It the Diet, the Exercise, or Both? (http://nutritionfacts.org/video/is-it-the-diet-the-exercise-or-both/)
• My last video, Enhanced Athletic Recovery Without Undermining Adaptation (http://nutritionfacts.org/video/enhanced-athletic-recovery-without-undermining-adaptation)

Don't have time? Yes you do! See: Standing Up for Your Health (http://nutritionfacts.org/video/standing-up-for-your-health/).

What else can we do to preserve our immune function? See:

• Boosting Immunity While Reducing Inflammation (http://nutritionfacts.org/video/boosting-immunity-while-reducing-inflammation/)
• Preventing the Common Cold with Probiotics? (http://nutritionfacts.org/video/preventing-the-common-cold-with-probiotics/)
• Sleep & Immunity (http://nutritionfacts.org/video/sleep-immunity/)
• Boosting Immunity Through Diet (http://nutritionfacts.org/video/boosting-immunity-through-diet/)

Nutritional yeast that's fortified can also be a convenient source of vitamin B12 (Safest Source of B12, http://nutritionfacts.org/video/safest-source-of-b12/).

Have a question for Dr. Greger about this video? Leave it in the comment section at http://nutritionfacts.org/video/preserving-immune-function-in-athletes-with-nutritional-yeast/ and he'll try to answer it!

Image Credit: ivymushbowl via Flickr.

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