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Health & Nutrition

10 Ways to Strengthen Your Immune System

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Considering that communicable diseases like colds and flu are highly contagious and have no cure other than to run their course, your best bet is to prevent becoming ill in the first place.

But, even if you do get sick this season, the severity and longevity of illness is highly dependent on the strength of your immune system and your body’s ability to fight off the invading virus. 

Low Immunity Sets the Stage for Sickness

Any illness, whether bacterial, fungal or viral, shows up in individuals who are “susceptible.” Making healthy lifestyle choices during cold and flu season (and all year round) will help build defenses in your body so you are not susceptible to illness.

But there are several very easy, all-natural steps you can take to strengthen your immune system and arm yourself against colds and flu today.

1. Eat Probiotic Foods

Did you know that 80% of your immune system is located in your gut? There are trillions of beneficial bacteria in your intestines that help you fight disease and absorb nutrients. Keeping this population healthy and strong is arguably your strongest defense against colds, flus and many other diseases. Replenish your gut flora daily by incorporating wholesome fermented foods and drinks into your diet like yogurt, kefir, sauerkraut and kimchee.

Fermenting your own vegetables is far more effective and affordable than buying probiotic supplements or other mass-marked products that only claim to boost your immunity. Not only will keeping your gut flora healthy help protect you from disease, but it can also give you better digestion.

And from real ginger beer to homemade pickles, there are so many delicious ways to enjoy probiotic foods at least once a day. (My favorite book about making probiotic foods here)

2. Eat Enough Good Food

Make sure you get three meals a day that include plenty of fresh vegetables, and enjoy healthy snacks if you need them, so your blood sugar stays relatively even throughout the day. It takes calories to form antibodies and dispatch them to the front lines when germs invade. When your calorie intake dwindles because you don’t eat enough or you skip meals, your body prioritizes other functions while your immune system is left to operate at a deficit.

But you don’t want to eat just anything! The nutrition that you get from whole fruits and vegetables is outstanding for preventing illness. Many vitamins, including vitamin C, are antioxidants and will protect cells—including those of your immune system—from damage by toxins in the environment.

Dark-colored produce (berries, kale, broccoli) tends to be higher in flavonoids, polyphenols and other antioxidants. Just make sure you eat a little saturated fat from butter or coconut oil with those veggies, so you can absorb all their nutrients.

3. Get Enough Sleep

Whatever amount of sleep you need to feel refreshed in the morning, whether that’s 6 hours or 10—make sure you get it! Insufficient sleep depresses the immune system, opening the door to colds, upper-respiratory infections, and other nagging ills. Also consider your caffeine intake, and don’t let it keep you from getting a good night’s sleep.

If you have a constricted airway that prevents you from sleeping deeply, Breathe-Right strips on your nose can be very helpful. If you have insomnia (which I often do), then a little warm cow’s milk (which provides tryptophan, a relaxing amino acid) or some magnesium drink can quickly and gently ensure you get a good night of rest. (My favorite book about curing insomnia here)

4. Consume More Glutamine

Your immune cells rely on an amino acid called glutamine to do their jobs. “Glutamine comes from protein foods, and if you’re not eating enough of those, your body will borrow from skeletal muscle, especially if you’re working out,” says Jose Antonio, Ph.D., C.S.C.S., CEO of the International Society of Sports Nutrition. In one study, marathon runners who took glutamine instead of a placebo had less chance of experiencing an upper-respiratory infection after racing.

Broths and stocks made from grassfed beef or chicken are an outstanding source of natural glutamine, and adding a cup a day to your diet can really boost your immune health—just like Grandma always said. But if you are an athlete, you may need to supplement with more. After exercising, try taking either an extra cup or two of broth, or 5 to 15 grams of L-Glutamine in pill or powder form to help with recovery. Your white blood cells (and your muscles) will thank you.

5. Get Plenty of Vitamin D

The majority of adults and children in the U.S. are deficient in the sunshine vitamin, putting them at greater risk for all infections. A number of recent medical trials have demonstrated that individuals with the lowest levels of vitamin D had the highest rates of serious illness and infections.

You can get Vitamin D naturally by daily exposing your arms and face for 20 minutes in the sun, but most people need more than this. Good dietary sources include good old fashioned cod liver oil (my favorite, least processed brand here), grassfed beef liver, egg yolks from pasture-raised chickens, and fatty fish like salmon.

You can also buy liquid Vitamin D supplements which are very effective and easy to take.

6. Eat Mushrooms

You can try shitake, maitake or other Asian mushrooms, but even the inexpensive and humble button mushroom is loaded with polysaccharides called beta glucans. Numerous medical studies have shown that beta glucans can positively modulate and strengthen the immune system and prevent infections. You’ll want to eat those mushrooms raw to get the most out of them.

In addition to finding it in all types of delicious, fresh mushrooms, you can also buy Beta Glucans as a supplement to take during cold and flu season.

7. Use Thieves’ Oil Generously

Thieves’ oil is a blend of the essential oils of clove, cinnamon, lemon, rosemary and eucalyptus. The blend is based on a recipe developed by a group of spice merchants in 15th-century Marseilles, France, who turned to thieving when trade was shut down due to a plague. They protected their health as they robbed the dead, sick, and dying by applying a combination of herbs, spices, and essential oils to their clothing and skin—a recipe which has since been unearthed in the British archives and used in the present day.

Thieves’ blend has been clinically tested and proven to be more than 99% effective against airborne bacteria (study conducted at Weber State University, 1997). It has been used to treat everything from candida and bacterial infections to toxic mold to colds and flu. I often take a drop and rub it into my washed hands after I use a public restroom. You can also mix several drops into a spray bottle of water, and use the spray to help disinfect the air and various surfaces around your home.

Because essential oils are made of light molecules, they are easily absorbed by the respiratory system and can be highly effective in treating sinus and respiratory disorders. I slather a few drops of Thieves on my throat and chest to treat a cold, or on the bottoms of my feet to keep well, and boost my immunity all winter long. Sometimes I’ll take a drop in a cup of hot water or tea to clear my sinuses and soothe my throat.

Please note: The Thieves’ oil recipe should only be made with therapeutic-grade, organic essential oils (where to find organic essential oils). Please be aware that the source of the oils is important, and labeling can be misleading. Some brands of essential oil can be very toxic! DO NOT use essential oils internally or on your body unless you’re sure of their quality and safety.

8. Drink Plenty of Water

Even overnight, during what amounts to an 8-hour fast, your immune reserves are being drained. Hydration becomes even more important when you’re sick. Fluids not only transport nutrients to the illness site, but also take toxins away for disposal. Green, rooibos, or herbal tea is another immune-friendly vehicle for consuming water. 

You don’t want to drink too much water though! There is too much of a good thing here. It’s important not to dilute and wash out the important minerals and electrolytes your body needs to remain healthy.

To gauge if you are getting the right amount of water, your urine should always be straw colored or darker. If it is clear, you are drinking too much water and slowing your metabolism down!

9. Steam Some Oysters

Oysters are the richest source of zinc, which is essential for immune cell function, and many studies have shown that even a mild deficiency depresses immunity. If you’re not a fan of bivalves, grab a grass-fed burger: Beef and buffalo are other good sources of zinc.

You can also get zinc from pumpkin seeds, which is the highest plant source of the mineral, but you’ll need to eat 3 whole cups of them to get the same amount of zinc that is in just 2 oysters!

Most people are low in zinc, so you might consider supplementing with zinc gluconate. Just know that zinc is not well absorbed in pill form, so it’s best to get it from food whenever possible.

10. Quit the Sugar

If you do only one thing to boost your immune system, eliminating sugar will do the most good. Refined sugar is a poison which, among other things, dramatically decreases immune function. Many scientists and nutritionists consider added sugar in any form to be a drug because of its negative impact on the human body. I have known health practitioners to prioritize eliminating sugar from the diet over recommending that people quitting smoking!

Healthier sweeteners such as honey or stevia can be used in moderation, but avoid artificial sweeteners like Splenda or Equal; they are even more toxic than cane sugar!

Most importantly, if you are feeling like you’re “fighting off a bug” or “coming down with something,” avoid sugar and sweet foods at all costs for a little while. In my experience, sugar is enough of an immune depressant that eating sweets of any kind when you are a little under the weather will likely tip the scales against you, and bring on that cold or flu full strength.


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