Understand the REAL cause of sickness, and strengthen your immune system with these tipsby Mike Geary - Certified Personal Trainer, Certified Nutrition Specialist
Author - The Truth about Six Pack AbsNote:  The tips in this article can work anytime of the year to keep you  healthy and prevent you from getting sick...not just in the winter!
First of all, let's clear up a BIG misconception about why more  people get sick in the winters compared to warmer times of the year.  I  always have to bit my tongue when I hear well intentioned mothers and   grandmothers tell their kids to "bundle up" before going outside so that  they don't "catch a cold".  So many people still have this huge  misconception that cold temperatures can make you sick...
However... This is blatantly false!
In fact, did you know that there are multiple studies that actually  show that cold exposure increases your immunity?  It's true!  One study I  read recently even showed that cold therapy such as ice water baths or  other cold water exposure stimulates an improvement in your immune system.
So are there really  more germs and cold & flu viruses floating around in the winter?   No, of course not!  In fact, some medical articles I've read have  indicated that there might actually be a slightly larger amount of cold  and flu viruses all around us in the summer due to more favorable  conditions for their survival on surfaces. So then why do more people get sick in the winter?  Well, I'll give you a hint... it's not the temperature, but rather the strength of the suns rays...  In winter in the northern hemisphere (Canada, US, Europe, etc)  sicknesses spike, but at the same time, it's summer in the southern  hemisphere (South America, Australia, New Zealand, etc), and while  sicknesses are spiking in the northern hemisphere, sicknesses are at  their lowest point in the southern hemisphere since it's their summer.
And then when we're in summer in the northern hemisphere and most  sicknesses go away, it's winter in the southern hemisphere, so colds,  flu, and other sicknesses spike in the southern hemisphere.
So is it the warm temperatures  that decreases sickness?  Nope... It's actually all about the strength  of the suns rays, and how much vitamin D your body produces due to the UV rays on your skin!There are 2 theories that many people pass around as to why more  colds, flu, and sickness occur in the winter depending on which part of  the world you're in...
Theory 1.  It may have to do with people generally  spending more time indoors in the winter and thereby being exposed to  more germs in enclosed buildings.  It's a nice theory, but people are  generally still in offices from 9-5 all week long whether it's summer or  winter.  As you'll see, theory 2 is the REAL culprit!
Theory 2.   The reason people get sick more in the  winter is mostly due to a drastic reduction in their body's production  of Vitamin D, which is directly responsible for how strong their immune  system is.
The suns rays are too weak in the winter generally, and therefore,  Vitamin D levels in the body drop significantly, which reduces immunity.  Most people don't realize how important sunlight and Vitamin D levels  really are towards so many functions inside their body, including immune  system and hormone production and balance.
Even for people that get outdoors in the winter often, if you live in the northern hemisphere to the North of an imaginary line from approximately Atlanta to Los Angeles,  the suns rays are not strong enough in the winter months (approximately  November through end of February) to stimulate any significant Vitamin D  production inside your body.
This aspect of lack of Vitamin D production and lowered immune  strength in the winter months is what is actually the REAL reason why  more sickness goes around in the winter.  So you can silently chuckle to  yourself the next time someone tells you to "bundle up" so you don't  catch a cold.
So how can you bolster your immune system so that your body can fight off sickness before it gets a hold of you?
So here is my little ritual that I've been using for a few years now  and really seems to keep me from getting any colds, flu, or any sickness  at all.
As a matter of fact, I can't remember the last time I was legitimately sick. 
I think it's been 6 or 7 years since I've actually been sick.
Every time I feel a cold or something starting to come on, I do this  ritual, strengthen my immune system, and my body always fights it off  before I actually get full-blown sick.
1. Focus on Vitamin D (but NOT in pill form or "fortified" foods)You need to be careful about artificial forms of vitamin D in many  vitamin pills, as artificial vitamin forms are almost always either  ineffective or possibly even detrimental compared to natural forms. For this reason, you need to get your vitamin D naturally. The sun is  the best source, and leads to a powerful strengthening of your immune  system when your body can naturally produce Vitamin D from moderate sun  exposure. Here is a previous article I did on how to get sun exposure in a healthy way without damaging your skin I know not everybody can take a tropical vacation every winter, but  if you can, it's best to try to take it right smack dab in the middle of  the winter (when your vitamin D levels have dropped to their lowest)...  getting even a few days of good sun closer to the equator in the middle  of winter can really help increase your vitamin D and strengthen your  immune system.
Remember that this does NOT mean getting burned in the sun... it  means getting a moderate amount of sun on large portions of your body  (not just your face) for approx 15-40 minutes per day WITHOUT sunscreen  on (since sunscreen blocks the UV rays that directly stimulate the  vitamin D increase in your body).
Everybody is different based on their skin tone... very pale skin  tones may only need 10 minutes or so in full sun in the middle of the  day to get adequate vitamin D before any skin damage occurs, but darker  skin tones may need a slightly longer time (sometimes 30-40 minutes) in  the sun to produce adequate vitamin D.  
To protect your skin, it's essential to get enough sun without sunscreen on, but NOT get burned.With that said, I understand that a tropical vacation in the winter  is not possible for everybody's schedule based on either work or  finances, so...
Since you may not be going on a tropical vacation this winter, how  can you still keep Vitamin D levels from falling dangerously low in your  body?
Well, the best food sources of natural Vitamin D are egg yolks, fatty fish, 
organ meats, and some mushrooms (some portobella mushrooms and maitake mushroom are fairly good sources of vitamin D).
But what I do to make sure I'm at least getting a decent amount of  the best absorbed vitamin D is to take a SMALL dose of cod liver oil  daily in the deepest months of winter to make sure my vitamin D levels  don't fall too low.  Make sure to take only small doses of cod liver oil  (enough for 50% to 100% DV of vitamin D), as large doses can give you  an overdose of Vitamin A.   I take about half to 2/3rds of the  recommended dose on the bottle.
I'm also a big fan of Prograde Nutrition's natural 
VGF-25 multi-vitamin,  which derives it's vitamin D from natural fish liver oil instead of a  synthetic form of vitamin D.  All of the other vitamins in VGF-25 (which  stands for "25 veggies, greens, and fruits") are naturally derived too  instead of most multi-vitamins that you find at your corner store that  are synthetic.
FYI - The synthetic version of Vitamin D is ergocalciferol (vitamin  D2), while the natural form is cholecalciferol (vitamin D3). By the way,  fortified milk has added D2, not D3... so that's NOT a good source.  In  fact, I don't trust any "fortified" foods at all, including crappy  breakfast cereals which claim to be good sources of vitamin D... not so!
2. Garlic to strengthen your immune system!Garlic is one of the most potent of all superfoods!  Not only does  high dose garlic go back thousands of years for treatment of sickness,  but recent studies back up the legendary claims for boosting your immune  system.
What's best though -- "aged" garlic pills, whole garlic in foods,  capsules, etc?  I can't seem to find a consensus on this one, so what I  simply try to do is use a variety of sources, including garlic powder on  a lot of my foods, fresh chopped garlic in meals, and also a garlic  capsule or two each day. If I feel a possible cold or sickness coming on, I really start  loading garlic into my foods heavily and I take a few extra garlic  capsules that day too. 
3. Kombucha tea strengthens immune systemKombucha tea is a fermented tea (naturally effervescent) that  contains billions of friendly gut organisms (probiotics) that help to  strengthen your immune system by bolstering your levels of good  organisms in your gut.
Remember that 70% of your immune system lies in your gut and the  health of the friendly organisms in there to protect you against  pathogens and sickness. You can find bottles of Kombucha tea at health food stores such as Whole Foods. When I feel any sickness coming on, I start loading up on Kombucha  tea, drinking it throughout the day. It has a strong taste, so I mix it  with my normal iced teas at 1/3 Kombucha and 2/3 regular iced tea.  I've  started seeing other probiotic drinks on the market recently too, so  just make sure to look for one that has very minimal sugar per serving  (3-6 grams per 8 oz serving is acceptable, but much more than that is  too sugary).
4. Green tea, Chamomile Tea, and other teasThere is evidence that green tea and chamomile tea can help aid in strengthening the immune system.
Even if the effect is small, you can't go wrong because both are loaded with powerful antioxidants unique to each tea. For that reason, I try to drink a couple cups of green tea with a  small bit of raw honey early in the day, and then at night, I have a  couple cups of chamomile tea.
This isn't a bad idea even for a regular habit, but it's even more  important when you feel a sickness possibly coming on.  I also drink a  lot of other teas too such as Rooibos tea, which is thought to be even  higher in antioxidants than green tea.
5. Loading up on antioxidantsWe already know how important antioxidants are to overall health as well as immune system support.
For this reason, I make sure to really load up on antioxidant-rich  fruits, berries, unsweetened cocoa (in smoothies, etc), and veggies to  help prevent sickness.
I also make sure to take my daily Longevity Antioxidant blend from my  friends at Prograde, which is a powerful synergistic antioxidant  mixture of green tea, wolfberry, acai berry, Biovin grape, coffeeberry,  and pomegranate.
I get that here:  Prograde Longevity Synergistic Antioxidant blend
6. Light exercise (yes - light exercise, not hard)When you feel a sickness coming on, a super-high intensity workout is  not a good idea, as hard training forces the body to do a lot of  recovery, this at a time when your body needs all of it's efforts on  trying to fight off the oncoming sickness.
Although I usually recommend high intensity training, when sickness  might be coming on, it's just a good idea to get some light exercise  instead.
Personally, I like to get outside for some fresh air and go for a  hike or go snowshoeing. These aren't very strenuous for me, so they  won't cause my body to be forced to do a lot of recovery... but just  getting out in the fresh air and getting the circulation going I feel is  good to help the body fight off the sickness.
7. Avoid ALL processed foods and sweetened soft drinksIf you're serious about your health and getting lean for life, this  should be an everyday rule for you anyway (except maybe for cheat  meals)...
However, when you might have a sickness coming on, this is no time to  bombard your body with processed foods, inflammatory omega-6 oils  (soybean oil, corn oil, etc), fried foods, high fructose corn syrup,  refined sugars, and chemical additives.
All of these force your body to do extra work to deal with all of  this junk and the internal inflammation that they cause in your body.
Instead, this is a time that you need to give your body only  wholesome unprocessed foods that are only 1 ingredient...fruits,  berries, veggies, eggs, nuts, seeds, grass-fed meats, etc.
I also have a daily serving of immune system boosting 
Athletic Greens, which is surprisingly delicious, plus contains loads of probiotics and antioxidants, and other immune supporting superfoods.
These 7 tips will go a LONG way to helping to ward off that sickness that is trying to get a hold of you... Here's to a healthy strong body!
Note: I'm not a doctor, and none of these tips are prescriptions for  any individual person... they are simply the steps I've personally used  over the years to successfully fight off sickness pretty much every  single time.  Again, I haven't been legitimately sick in at LEAST 6 or 7  years now that I use these steps!
Please feel free to share this page with your friends and family to keep them healthy and strong!