On this page
Every winter you swear this year will be different. You take your vitamin C, you wash your hands like a surgeon, and you still spend two weeks in November blowing through a box of tissues while everyone around you stays fine. That is not bad luck. That is your body telling you something is off underneath the surface, and it has been trying to tell you for a while.
What I Actually See in Coaching Clients Who 'Always Get Sick'
I want to be clear about something before we go any further: getting a cold once or twice a year is normal. Your immune system is supposed to encounter pathogens and respond. That is how it stays sharp.
What is not normal is catching every single thing that goes around, being the one in the room who gets whatever bug is passing through, and then taking three times as long as everyone else to feel human again. That pattern tells me something systemic is going on. It tells me the immune system is not starting from a position of strength.
In my coaching practice, I almost always see a cluster of the same contributing factors. They stack on each other. None of them on its own tanks your immunity completely, but together they keep your defenses perpetually low-grade depleted. And here is the part the conventional model often misses: none of those factors are "you just need a better supplement." They are lifestyle and terrain issues. The immune system is downstream of everything else.
The First Thing I Would Change (Before Anything Else)
Sleep. Full stop.
I know you have heard this. I know it sounds like a cop-out when you came here hoping for a specific protocol or a supplement stack. But if I am sitting across from a client who catches every illness that goes around and I can only pick one thing to address first, it is always sleep, because nothing else works the way it should when sleep is compromised.
Here is the actual biology. During deep sleep, your body produces and releases cytokines, the proteins your immune system uses to coordinate a response to infection and inflammation. Research published by the National Institutes of Health has shown that sleep deprivation reduces cytokine production, suppresses natural killer cell activity, and impairs the immune memory your body uses to recognize and fight pathogens it has seen before. A landmark study from Carnegie Mellon University found that people who slept fewer than seven hours a night were nearly three times more likely to develop a cold after being exposed to a rhinovirus than those sleeping eight or more hours.
Three times more likely. That is not a small effect. That is not "sleep is nice to have." That is sleep being a foundational pillar of immune competence.
So before we talk about anything else, I ask clients to get honest about how much actual, quality sleep they are getting. Not hours in bed scrolling. Not lying awake at midnight running through tomorrow's to-do list. Real, restorative sleep, seven to nine hours for most adults, in a room that is dark and cool. That one change, consistently applied, can shift the immune picture more than almost anything else I have seen.
The Layers Underneath: What Else Is Draining Your Defenses
Once sleep is on the table, we can start pulling the other threads.
Chronic low-grade stress is an immune suppressor. I covered the full stress-hormone picture in a different piece, so I will not repeat it all here. But cortisol, when it is chronically elevated from a life that never fully downshifts, directly inhibits immune function. The American Psychological Association has summarized decades of psychoneuroimmunology research showing that chronic stress is linked to decreased antibody response, increased susceptibility to infection, and slower wound healing. If your nervous system thinks it is always outrunning a tiger, it deprioritizes fighting viruses. That is a feature of your biology, not a flaw. It just becomes a problem when the tiger is your inbox and it never goes away.
Your vitamin D status matters more than you probably think. Vitamin D functions more like a hormone than a vitamin, and its role in immune regulation is significant. Vitamin D receptors are found on virtually every immune cell, and research published in the BMJ found that vitamin D supplementation reduced the risk of acute respiratory infection, particularly in people who were deficient. A large portion of American adults are deficient or insufficient, especially those who spend most of their time indoors, live in northern latitudes, or have darker skin pigmentation. This is one of the first labs I look at when a client tells me they are always sick.
Zinc depletion is underappreciated. Zinc is involved in the development and function of immune cells, and deficiency is associated with increased susceptibility to infection. The NIH Office of Dietary Supplements notes that even mild zinc insufficiency can impair immune function. Eggs are actually a decent source of zinc alongside their other nutrients, which is one of the reasons I lean on them as a real-food daily staple rather than looking for a supplement first. Two eggs at breakfast, pasture-raised when you can find them, gives you protein, zinc, choline, and fat-soluble vitamins in a package your body recognizes.
How you eat overall is immune infrastructure. Ultraprocessed food drives systemic inflammation and disrupts the microbial environment in your gut, which is intimately connected to immune signaling. I am not going to write a whole gut piece here because that is its own lane, but I will say this: your immune system is not housed in a separate compartment. It is woven through your whole body, and the food you eat either feeds the system or taxes it. Whole food, quality protein, colorful vegetables, and real fat are the base. They are not optional.
The Pattern I See in People Who Stay Well
The clients who genuinely shift their susceptibility to illness are almost never the ones who went and bought a fancy supplement protocol. They are the ones who did the unsexy work of building a consistent foundation.
They prioritized sleep even when life made it inconvenient. They found ways to actually decompress, not just collapse in front of a screen. They got outside in the morning and let natural light hit their eyes, which helped regulate their circadian rhythm and their cortisol curve. They ate real food most of the time. They stayed hydrated. They moved their bodies regularly without destroying themselves in the process.
None of that is glamorous. None of it sells well on Instagram. But when I have a client who used to get sick every six weeks come back and tell me they made it through the whole winter without a single sick day, it is always those boring fundamentals that did it.
That is what immune resilience actually looks like. Not a magic mushroom tincture (though some adaptogens have legitimate supporting research). Not another zinc lozenge after you are already sick. A body that was actually prepared before the exposure happened.
I see us as stewards of these bodies we have been given. That stewardship includes rest, real food, stress that we actually manage rather than just push through, and the humility to acknowledge when our lifestyle is running the system into the ground. The immune system is not failing you. It is working with exactly what it has been given to work with.
Where to Actually Start This Week
If this is resonating and you want a practical place to land, here is what I would coach:
First, get honest about your sleep. Not your intention to sleep more. Your actual average hours of real sleep. If it is under seven, that is the work right now. Everything else is secondary.
Second, get your vitamin D level checked. Ask your doctor for a 25-hydroxy vitamin D blood test. Optimal functional range is generally considered to be between 50 and 80 ng/mL by many functional medicine practitioners, though conventional labs will call anything over 30 sufficient. Know your number.
Third, eat a real breakfast. Two or three pasture-raised eggs with some vegetables and quality fat is not just a paleo talking point. It is a practical way to get protein, zinc, choline, and fat-soluble vitamins into your body before the day starts pulling at you.
Fourth, look at your stress load honestly. Not just the big stressors but the chronic low-grade ones: the too-full schedule, the bad sleep habits, the never fully switching off. That cortisol drip is costing you.
Start there. Build from there. You are not broken. You are just running a depleted system, and depleted systems can be rebuilt.
This article is for general informational purposes only and is not medical advice. Always consult a qualified healthcare professional before making changes to your diet or health routine.
Key Takeaways
- Frequently getting sick is a signal that your immune system is running depleted, not just bad luck.
- Sleep is the single highest-leverage change for immune resilience: fewer than seven hours has been linked to nearly triple the risk of catching a cold in controlled research.
- Chronic stress, low vitamin D, and zinc insufficiency are three of the most common and overlooked contributors to frequent illness.
- Whole, real food provides the raw materials the immune system needs; ultraprocessed food actively taxes the system.
- Immune resilience is built in the boring fundamentals over time, not rescued by supplements after the fact.
Frequently Asked Questions
Why do I keep getting sick even when I eat healthy?
Nutrition is one piece of immune resilience, but it is rarely the only piece. If you are eating well but still getting sick frequently, the most common culprits I look at are sleep quality and duration, chronic stress and elevated cortisol, low vitamin D (which is extremely common even in health-conscious people), and zinc status. A body can eat well and still run depleted if the other pillars are not in place.
How much sleep do I actually need for a strong immune system?
Most adults need seven to nine hours of actual sleep, not just time in bed. Research has shown that consistently sleeping fewer than seven hours is associated with significantly higher susceptibility to respiratory infections. The quality of that sleep matters too: deep, uninterrupted sleep is when your body produces the cytokines and other immune proteins it needs to stay ready.
What vitamin D level should I aim for immune health?
Ask your doctor for a 25-hydroxy vitamin D blood test. Many functional medicine practitioners consider 50 to 80 ng/mL an optimal range for immune support, while conventional labs typically flag anything over 30 ng/mL as sufficient. Knowing your actual number is the starting point, because supplementing blindly without knowing your baseline is not good practice.
Can chronic stress really make me catch more colds?
Yes, and this is well documented in the research. Chronically elevated cortisol suppresses several branches of immune function, including the production of antibodies and the activity of natural killer cells. The American Psychological Association has summarized decades of research linking chronic stress to decreased immune response and slower recovery from illness. Managing stress is not just a wellness talking point. It is an immune strategy.
Sources
- National Institutes of Health (PMC): Sleep and Immune Function
- JAMA Internal Medicine / Carnegie Mellon University: Sleep Duration and Susceptibility to the Common Cold
- American Psychological Association: Stress Effects on the Body: Immune System
- The BMJ: Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis
- NIH Office of Dietary Supplements: Zinc: Fact Sheet for Health Professionals
This article is for general informational purposes only and is not medical advice. Always consult a qualified healthcare professional before making changes to your diet or health routine.
