Keep calm and bolster your immunity

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With a potential pandemic* and flu season still in swing, take time to review finer details: strengthen your immune system as much as possible, protect yourself and loved ones, and be prepared.  
As with all viruses, your immune system status is a critical factor. If you’re stressed-out, run-down, or eating not-so-healthy, you’re more susceptible to getting sick. Take all of these together, and you just might catch the flu if an infected person even looks at you!
That said, there are proven nutrition and lifestyle interventions you can implement to boost your health and strengthen your immune system. 

Here are 5 strategies to elevate your health and care for your immune system.

Take care to prioritize the things you can control, such as nutrition and the foods you eat, exercise, stress, and how you handle stress.
  1. Nutrition!

    Put good things into your body and expect more good to come out of it. This includes a healthy immune system.

Just how is nutrition tied to the immune system, you might wonder? 

With an estimated 100 trillion microbes and near 1,000 different types of bacteria1, your gut holds the key to a healthy immune system. In fact, nearly 70% of your immune system resides in your gut through a vast presence of immune cells2.  
So how do you maximize gut health and protect your immune system?
  • Healthy diversity is key. You want to feed the widest variety of gut bacteria possible, through a wide variety of real, whole foods. 
  • Especially eat lots of plants – and lots of different types of plants. Plants tend to have good fiber, which is essential for gut health. 

When it comes to gut health, a robust healthy diversity is best. An ongoing non-profit project, the American Gut Project reports that the more plants you eat, the betterand the more diversity of the plants you eat, the better. In fact, they found increased levels of anti-inflammatory CLA (conjugated linoleic acid) in individuals who ate 30 or more different types of plants each week3


So what specific foods help feed a healthy gut and healthy immune system? Here’s a list:

  • A wide variety of whole foods including fresh vegetables & fruitbrightly colored for antioxidant protection. Look for deep greens (kale, chard, spinach, collards), deep blues (blueberries, blackberries), bright purples (cabbage, radish), reds (bell pepper, raspberries, tomatoes), oranges (carrots, bell pepper), and all shades in between. Try something different like watermelon radish, turnips, parsnips, or kohlrabi when in season. 
  • Cultured or Lacto-fermented foods, like sauerkraut and kimchi – or natto. Yogurt is great, so long as dairy is tolerated. 
  • Healthy Fats: Omega-3s from coldwater fish (wild salmon, sardines) or fresh ground flax seeds. Monounsaturated oils like Extra virgin olive oil or Avocado oil.
  • Sustainable meats like organic pastured chicken and limited amounts of organic pastured red meat like lamb or beef. Bone broth made from any of these provides exceptional nourishment and soothing for the gut. 
  • Garlic* and Onions. Part of the allium family, alongside shallots, leeks, and scallions. Alliums contain organosulfur compounds that are immune-boosting and health-promoting, with benefits ranging from decreased inflammation and blood pressure to increased heart protection and potential cancer protection. As a rule of thumb, the more pungent the taste, the stronger the antioxidant protection. Press or mince whole raw garlic for use in salads, dressings, or avocado toast. Go for the bolder flavored red or yellow onions – or select smaller onions for a more powerful punch4
 *Autoimmune patients may need to avoid garlic, as its effects on an already-overactive immune system can be counterproductive.
  • Polyphenols in coffee, tea, and red wine – in moderation. Studies have shown that just 1 glass of red wine per week can help promote microbiome diversity5,6. Of course, too much alcohol can wreak havoc on gut ecology – so if you’re not able to handle moderation, it may be best to avoid altogether.  

Other gut and immune ‘sabotage agents’ include refined sugars and refined carbohydrates, artificial sweeteners, trans fats, and oxidized fats. Avoid these like the plague. (pardon the pun)

2. Vitamin D status

The research here is compelling. Vitamin D is not only a bone-health facilitator but also a key immune function modulator. Of course, your body makes Vitamin D in the presence of sunlight, but most of us don’t get anywhere near the kind of sun exposure needed for healthy levels (nevermind the dermatological concerns). 

Vitamin D levels below 30 ng/mL put you in the danger zone – at risk for infections and autoimmunity7. Many functional medicine experts want you closer to 60-80 for “optimal” immunity.

Personally, I’ve been holding steady at 53 ng/mL for over 10 years and have consistently taken Vitamin D3 daily. I worked through the dosage with the help of a medical professional and recommend you do the same. Don’t start supplementing before you know your actual Vitamin D serum level – then you can work with your healthcare professional to determine what dosage might be right for you. Ask your physician for the 25-hydroxy (25-OHD) blood test for Vitamin D level. 

3. Stress Management

The Goldilocks principle applies here. We want just the right amount of stress – not too little and definitely not too much. Stress can make us more resilient and productive; but in excess, stress can tear down immunity. Key is to know and honor your threshold for stress. With a pandemic on the horizon, you may now want to take steps to dial back any stress you can control, and prioritize self-care. Take time to breathe deep, stretch, meditate, and unwind. The road ahead is always uncertain, though it seems even more so today.  

With stock market dives, election uncertainty, and fears around productivity and life as we know it changing – keep focused and calm. This is a moment in time, and we will get through it. Take the long view. 

4. Exercise  

Goldilocks makes another appearance with exercise. Did you know exercise literally is stress? It’s typically good stress, that energizes us and regulates a healthy metabolism. But too much stress (i.e. exercise), as mentioned above, is just that – too much. Take care you don’t overwork your body and deplete your immune system by pushing too hard for too long, too often.

5. Sleep

Lack of sleep also qualifies as stress. Ongoing impaired sleep disrupts hormones and can result in elevated cortisol, blood sugar, and risk for illness and disease. Aim for 7-8 hours a night. If helpful, establish a wind-down routine to help you settle into bed. Try to avoid electronics before bed and certainly while you’re in bed, as tempting as it may be to reach over and see ‘all you’ve missed’ at 3 am! 

Healthy Anywhere survival guide for immunity
Immune-boosting tips in our essential guide to living Healthy Anywhere

A word of caution: Be careful with ‘immune-boosting’ supplements, herbs, teas, adaptogens, mushrooms, etc.

While it may seem a great idea to load up on all the immune-boosting extras you can get your hands on, know it is possible to rev up your immune system too much – to the point it literally attacks your own healthy tissues. You don’t want this! And if you have one or more autoimmune disease(s) or are predisposed to autoimmune – I would leave these alone, as it’s not worth the risk. Focus on the healthy nutrition and immune-supportive lifestyle measures described above.    

In terms of preparation for a pandemic itself, I defer to the experts at the CDC. 

Physical distancing from the illness may be key for the elderly and for immunocompromised individuals, as well as individuals with pre-existing health conditions. These groups reportedly are at the highest risk for severe illness. 

While we’re rapidly learning more each day, it seems the new coronavirus may be more contagious than the flu, though all the mechanisms of how it’s spread are unclear. With not only human-to-human but also suspected surface-to-human spread, good hygiene and handwashing are imperative. 

Handwashing must be frequent and thorough. Experts recommend 20 seconds of scrubbing with soap(!), creating a lather up to your wrists and getting in all the nooks and crannies (between fingers, around fingernails & nail beds, etc). Singing your ABC’s (x2) is a good cue for 20-30 seconds. Try it next time you wash your hands, singing all the way to “next time won’t you sing with me”. And try not to touch your face throughout the day. 

Travelers ideally should wipe down all surfaces they may touch and be sure to properly wash hands frequently.  Don’t forget germ-laden TSA bins and random surfaces like seatback touchscreens, transit handrails, etc. 

Standard emergency preparation procedures also apply. Have a plan and work your plan. Experts say 2 weeks of emergency food and water at home should be sufficient – no need to hoard!

Keep calm, keep safe, and be kind to your body by supporting a healthy immune system. 


Nine immune-boosting Nutrients you need this Year

An in-depth look at nine whole-food nutrients that help boost your immune system. Includes the benefits of each nutrient, where to find it on the road, and how to use it at home.

A surprising cause of illness.. and what to do about it

A short musing on the ‘stress equation’ every frequent traveler or Type A needs to know. 

World Health Organization handwashing visual guide

It’s worth a quick look at the WHO website for a primer.


*Please note this article was published in February 2020, before the major onslaught of COVID-19 in the U.S. and before the WHO labeled COVID-19 an official pandemic. 


As always, discuss with your physician before making any changes to your diet or lifestyle. This is not intended to be medical advice. 

This is also not intended to represent one or more tactics to prevent or treat coronavirus. At the present moment, protective measures are our only option. Anything you can do to put yourself in better health status is positive from our perspective, and we recommend these measures as part of a healthy ongoing lifestyle – not just during times of viral outbreak. 

1. Chassaing, B., Vijay-Kumar, M., & Gewirtz, A. T. (2017). How diet can impact gut microbiota to promote or endanger health. Current opinion in gastroenterology, 33(6), 417–421.
2. Vighi, G., Marcucci, F., Sensi, L., Di Cara, G., & Frati, F. (2008). Allergy and the gastrointestinal system. Clinical and experimental immunology153 Suppl 1(Suppl 1), 3–6.
3. American Gut Project. Our Results so Far. (2017). Retrieved at:
4. Robinson, Jo. (2013) Eating on the wild side. 47-73. Hatchette Book Group.
5. Engen, P., Green, S., Voigt, R., Forsyth, C., & Keshavarzian, A. (2015). Alcohol and the Immune System. Journal of the National Institute on Alcohol Abuse and Alcoholism. 37(2). Retrieved from 
6. Le Roy, Caroline I. et al. Red Wine Consumption Associated With Increased Gut Microbiota α-Diversity in 3 Independent Cohorts. Gastroenterology, 158(1), 270 – 272.e2 Retrieved from
7. Aranow C. (2011). Vitamin D and the immune system. Journal of investigative medicine: the official publication of the American Federation for Clinical Research, 59(6), 881–886.

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4 thoughts on “Keep calm and bolster your immunity

  1. Kristin Reply

    Thanks, Leigh! Great holistic approach to maintaining good health year-around, but particularly important with the potential of an epidemic approaching.

    • Healthy Anywhere Post authorReply

      Thanks, Kristin for your comment! Glad you found it helpful.

  2. Sharyl Reply

    It’s good as your other posts :D, thanks for putting up.

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