7: Shun Tobacco Smoke.
Tobacco smoke triggers inflammation, increases respiratory mucus, and inhibits the hairlike projections inside your nose (cilia) from clearing that mucus. Children and adults exposed to tobacco smoke are more at risk for respiratory infections, including colds, bronchitis, pneumonia, sinusitis and middle ear infections.
8: Consume Friendly Bacteria.
Beneficial microorganisms colonize our intestinal, lower urinary and upper respiratory tracts. They outcompete bad “bugs” and enhance immune function. You can consume such bacteria in the form of live-cultured products such as yogurt, sauerkraut and kimchi. Probiotic supplements, available at natural food stores, may reduce the risk of antibiotic-induced diarrhea, viral diarrhea, vaginitis and respiratory infections.
9: Expose Yourself.
Vitamin D plays a number of roles in promoting normal immune function. Vitamin D deficiency correlates with asthma, cancer, several autoimmune diseases (e.g., multiple sclerosis), and susceptibility to infection (including viral respiratory infections). One study linked deficiency to a greater likelihood of carrying MRSA (methicillin-resistant Staphylococcus aureus) in the nose.
Unfortunately, nearly one-third of the U.S. population is vitamin D deficient. Because few foods contain much vitamin D, your best bet is to regularly spend short periods of time in the sun (without sunscreen), and to take supplements in northern climes during the colder months. Guidelines for the Recommended Daily Allowance (RDA) of vitamin D, currently set at 400 IU/day, are being revised. Experts predict that the new RDA will be about 1,000 IU/day (25 ug/day).
10: Choose Vitamin and Mineral Supplements Wisely.
Studies link deficiencies of zinc, selenium, folic acid, and vitamins A, B6, C, D and E to reduced immune function. But scientists have yet to pinpoint exact levels of these nutrients for optimal immune function, much less whether dietary supplementation really helps the average, well-fed American. For instance, research on vitamin C for prevention and treatment of the common cold has been inconclusive. Some micronutrients, notably vitamin A, can be toxic in overdose. Excessive levels of zinc paradoxically suppress immune function. A varied, plant-based diet and a good multivitamin supplement should meet your needs.
11: Immunize Yourself.
Routine vaccinations have had a huge impact on reducing, and in many cases nearly eradicating, a number of infectious diseases. Most immunizations occur during childhood. Vaccinations for adults to consider include yearly influenza vaccines, tetanus boosters, the shingles vaccine for people 60 and up, and the pneumococcus vaccine for people over the age of 65. For more information, check with the Centers for Disease Control.
12: Familiarize Yourself With Immune-Enhancing Herbs.
A long list of medicinal plants contain chemicals that enhance immune system activity, including echinacea, eleuthero (also called Siberian ginseng), ginseng (Asian and American), astragalus, garlic, and shiitake, reishi and maitake mushrooms.
Garlic is the favorite choice of many. In addition to boosting the immune system, it’s anticancer and antimicrobial against a variety of bacteria, viruses, fungi and parasites. Key ingredients don’t survive cooking, so add a clove or two of raw, minced garlic to meals just before serving.
When someone in my family sniffles, I make an immune soup based on a recipe Brigitte Mars shared with me years ago:
Pretend you’re making chicken soup. Sauté onions, shiitake mushrooms and chicken, adding just enough water to keep the chicken from drying out.
Remove the chicken when it’s cooked and set aside. Add fresh vegetables such as carrots and celery. Cover with plenty of water. Toss in three or four astragalus roots (the pressed roots, available in natural foods stores or from online herb retailers such as Mountain Rose Herbs and Pacific Botanicals). Toward the end of cooking, add Italian seasonings (thyme, rosemary, oregano), which are tasty and antimicrobial, and the chopped, cooked chicken. Before serving, add fresh, pressed garlic (one to two cloves per person) and remove the astragalus roots.
The Hygiene Hypothesis
Some people respond to front-page news about microbes — bird flu, flesh-eating bacteria, pathogenic E. coli — with excessive soap, water and hand-sanitizer use, along with avoidance of fun activities such as dining out, hugging dogs, camping, French kissing and mud wrestling. But the science says to get a little dirty. Some exposure to “germs” will mature and strengthen your immune system.
Some experts even point to evidence that an over-sanitized environment is bad for your health, increasing the risk of allergic, autoimmune and inflammatory conditions. The so-called Hygiene Hypothesis posits that exposure to microbes early in life flexes and shapes the immune system to do what it was designed to do, like fight off the ebola virus. Growing up in an ultra-clean environment, though, may produce an immune system that attacks innocuous things (animal dander, ragweed pollen, your own cells), leading to chronic inflammation. In support of that hypothesis, children who grow up in larger families (blessed with germy siblings), live in the country (around barnyard animals), or attend day care have lower rates of conditions such as asthma, hay fever and eczema. On the other hand, improved sanitation (along with vaccinations and antibiotics) has clearly decreased the death rate from infections and lengthened our lives. Infections, however, continue to challenge us, which means that the Hygiene Hypothesis (and other immunity-boosting practices) remains a hot topic in immunology circles.
I sincerely hope that at least some part of this series helps you to stay healthier.
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