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3) Sleep. Many studies on animals and humans have verified that sleep is critical for immune function (and testosterone by the way). For example, one 2009 study looked at 153 healthy adult men and women and actually infected them with cold viruses. Those who slept longer and better were MUCH more resistant to the colds.  Let me quote from the study: "Participants with less than 7 hours of sleep were 2.94 times more likely to develop a cold than those with 8 hours or more of sleep. The association with sleep efficiency was also graded: participants with less than 92% efficiency were 5.50 times more likely to develop a cold than those with 98% or more efficiency". See this link on Sleep for more information as well.
4) Tea. Tea activates your body's T cells through L-theanine, an amino acid found in tea. T cells are your first line of definse against bacterias and viruses. Furthermore, this leads to increased interferon output.  This is like taking away a pen knife and arming your immune cells with RPG's instead.
5) American Ginseng. One recent, well-designed study of North American Ginseng used a 80% 200 mg extract and found that Ginseng improved outcomes on colds by almost every standard measure: it decreased the # of colds, the number of people catching two or more colds, cold symptoms and the average duration of colds. 
6) Honey. Honey was found (admittedly in one obscure German) study to improve bronchitis and asthma.  Honey has also been found to have anti-tumor and anti-inflammatory properties in other research and can give a nice boost in Nitric Oxide for erectile strength.
7) The Two W's: Water and Warmth. Your mama was right: you need to keep warm during winter as otherwise your body must divert needed resources towards raising your body temperature instead of boosting your immune system. And mucus in your nose is one of the major defense barriers and, if overly dry, leaves you vulnerable to colds and flus.  That's an impressive reduction to say the least.
8) Exercise. A number of studies have shown that exercise improves immunity, including increasing macrophage counts and the speed at which immune cells cycle through the body, etc. Already one 2006 study of obese, sedentary women directly found that exercise (45 min/day of mostly brisk walking) significantly reduced their incidence of colds.  And four years later a study of a thousand adults found that those with the highest fitness levels and/or did aerobic exercise more than five times per week were almost half as likely to have an upper respiratory tract infection such as a cold. 
9) Humidity. One study found that 80% of influenza viruses survived in dry conditions but only 10% moist.  In other words, a home humidifier may help during the cold and flu season.
10) Vitamin D. Low Vitamin D levels have been linked in multiple studies to increased frequency of colds and flus. Vitamin D is a miracle pill that boosts immunity, fights cancer, decreases bone loss, increases heart health and on and on. One study found that the lower range of Vitamin D individuals had a 30+% increased chance of an upper respiratory infection. 
11) Zinc. Regular readers of Peak Testosterone already know the importance of Zinc in keeping Estrogen levels in check. Zinc also has several immune-boosting powers. Zinc aids the body's production of lymphocytes, or infection-fighting white blood cells, and Zinc has been shown to inhibit the growth of visuses in the lab anyway. A lack of Zinc has also been shown in several studies to decrease immunity and prolongs recovery time.  (Studies are mixed as to whether supplemental zinc helps with colds across the board however.) There are many things that will deplete a guy's Zinc - ejaculating and exercise being chief among them - and so it is easy for us male studs to become depleted. CAUTION: Please do not take more than 1-2 times the RDA of Zinc and read How Excess Zinc Can Be Dangerous. In addition, watch out for Zicam or other zinc forumulations for your nasal passages: they can lead to a permanent loss of smell.
12) Orgasm.. Would you believe that an orgasm can increase signficantly the number of specialized killer cells that attack invaders.  Other studies have shown a nice rise in antibodies for those having regular sex. 
13) Hand Washing. Recent studies have shown that frequent handwashing can reduce the incidence of respiratory colds and flus by about a quarter and stomach illness by about a half.  It can also keep you from eating crap, literally. One reporter swabbed door handles and other daily surfaces and submitted them to a lab. Over half of the samples had fecal contamination.  A more formal British study found that 28% of commuters had fecal contamination on their hands.  A recent study also showed that hand drying techniques are also critical. Hand drying by rubbing ones hands together merely raised embedded germs to the surface. 
14) Cranberry Juice. One recent study showed that cranberry juice helps the body protect itself from some of the nastiest bacteria, e. coli and s. aureus.  Of course, these are some of the deadliest bacteria we have in everyday life with e. coli being responsible for many deadly food poisonings and s. aureus to blame for staff and MRSA infections. Previous studies have shown that said juice makes life miserable for H. Pylori, the bacteria that often leads to stomach ulcers and/or cancer.  How does cranberry juice work its magic against these microbial heavy hitters? It prevents these two bacteria from sticking to tissue walls and/or forming biofilms, which are mesh-like networks that allow the spread and proliferation of the infection. Don't forget that cranberry juice protects against urinary tract infections and raises HDL. Yes, all in a day's work for one of nature's superfoods.
15) High Protein Diets. Higher protein diets have been linked to various immune disorders and decreased immune function. For more details, see my link on Protein and Immunity.
16) Probiotics. What is one of your biggest immune defenders? Your colon! (Yes, health can be counterintuitive.) Intestinal flora provide your body with one of its most important lines of defense and, more importantly, regulate a variety of immune function pathways. One study after another has stacked up in the last ten years showing that the right kind of probiotics can actually prevent colds and other upper respiratory tract infections. Yes, it looks like there is a cure for the common cold, or at least a big gun in one's arsenal.
The pro-probiotics movement recently gained momentum when the Cochrane Collaboration did a meta-analysis on all these studies and concluded that certain probiotics showed a substantial reduction in the number of colds.  Products with a good track record are "Lactobacillus casei DN-114 001 (DanActive), Lactobacillus reuteri ATCC 55730 (BioGaia Probiotic drops), Lactobacillus rhamnosus GG (Culturelle), and LcS (Yakult)." 
1) Amer J of Clin Nutr, Oct 2007, 86(4):1167-1173
2) Clin Exp Immunol, 1978 May, 32(2): 370–379
3) Lancet, 2003, 361:1496-501
4) J Am Coll Nutr, 2003 Apr, 22(2):174-82
5) J Nutr, 2005, 135:2911S, Bukowski, "Is the Increased in [Delta Gamma} T Cell Priming by Dietary Alkylamines Sufficient to prevent Cancer? What Other Components of the Diet Prime [Delta Gamma] T Cells?"
6) CMAJ (Canadian Med Jour), October 25, 2005, 173(9), "Efficacy of an extract of North American ginseng containing poly-furanosyl-pyranosyl-saccharides for preventing upper respiratory tract infections: a randomized controlled trial"
7) Archives of Internal Medicine, 2009, 169:62-67
8) Therapie der Gegenwart, 1970 Feb, 109(2):260-8, "Treatment of chronic bronchitis and bronchial asthma with honey"
9) Woman's Day, Riva Rahl, MD, Med. Dir. Copper Wellness Program, Dec 1 2009, p. 114.
10) Amer J of Med, Nov 2006, 119(11)
12) Prevention, Jan 1009, p 16.
14) Neuroimmunomodulation, 2004, 11(5):293-298,"Effects of Sexual Arousal on Lymphocyte Subset Circulation and Cytokine Production in Man"
15) BBC News, "Sex The Cold Cure", Wednesday, April 14, 1999
18) Shape, Nov 2009, p. 158.
19) Epidemiol Infect, 2010 Mar, 138(3):409-14. Epub 2009 Sep 2, "Dirty hands: bacteria of faecal origin on commuters' hands"
20) Journal of Applied Microbiology, Article first published online: 7 SEP 2010, "Comparative evaluation of the hygienic efficacy of an ultra-rapid hand dryer vs conventional warm air hand dryers"
21) Presented at The 240th American Chemical Society National Meeting & Exposition, August 25, 2010, “Oral consumption of cranberry juice inhibits cellular adhesion and biofilm formation of uropathogenic bacteria” (Abstract #189)
22) Critical Reviews in Food Science and Nutrition, 2002, 42(S3):279-284, "Inhibition of Helicobacter pylori Adhesion to Human Gastric Mucus by a High-Molecular-Weight Constituent of Cranberry Juice"
23) Cochrane Database of Systematic Reviews, 2011, Issue 9, "Probiotics for preventing acute upper respiratory tract infections".
25) Br J Sports Med, 2010, "Upper respiratory tract infection is reduced in physically fit and active adults"
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