The winter months bring cosy nights, festive cheer – and the dreaded cold and flu season. It may be difficult to keep your energy levels up, or you may feel like you are avoiding winter bugs the whole time.
Sound familiar?
At this time of year, many of us find ourselves asking, “what can I eat to boost my immune system?” or wondering how to stay ahead of winter bugs before they take hold.
Cold and flu might feel horrible, but they allow our bodies to cleanse. The body uses the change of seasons to have a good cleanse, which is why it’s important to let it run its course and not suppress the symptoms with lemsip. Check out my blog here on natural ways to support your body to cleanse during an acute infection.
For me, this topic hits close to home. At the age of 24, I got what I thought was the flu. I powered on through, trying to suppress the symptoms. This then developed into M.E. and fibromyalgia, leaving me in bed with assistance at home for almost a decade, losing 11 years of my working life.
Looking back, the signs of a struggling immune system were all there – dry skin, hay fever, food intolerances, and digestive issues like acid reflux. Back then I thought it was normal – part of life.
What I didn’t know then is that 80% of the immune system is in the gut), and everything from the food we eat to how we live impacts how well our bodies fight off illness. If I’d understood how to support my health naturally, I could have saved myself 11 years of frustration and pain and could have been living life.
But you don’t have to go through what I went through (that’s why I started my practice)!
In this blog, I’m sharing some simple, practical tips to boost your immune system naturally this winter, so you can stay energised, healthy, and ready to take on the season.
Why Winter Hits Your Immune System Harder
It’s no secret that winter can be tough on your health. The shorter days mean less sunlight, which often leaves your vitamin D levels running low. Then there’s the dry, stuffy air from central heating that makes it easier for bugs to take hold. Combine all that with festive overindulgence and the stress of a busy season, and it’s the perfect recipe for feeling run down.
Recognising these challenges is the first step. Fortunately, with some simple adjustments, you can give your immune system the boost it needs to stay strong all season long.
How to Spot the Signs of a Struggling Immune System
Remember that 80% of your immune system resides in your gut. So look out for these signs of poor gut health:
- Digestive issues: bloating, diarrhoea, constipation, acid reflux, or feeling overly full after meals are just some of the obvious signs of poor gut health..
Your immune system might also need a helping hand if you struggle with any of these symptoms:
- Recurrent infections: these could be any type of infection from urinary tract infections and fungal nail infections to frequent colds and flu.
- Slow wound healing
- Autoimmune conditions: often, especially with underactive or overactive thyroid, people are unaware that this could potentially be autoimmune.
- Low energy: fatigue that lingers no matter how much rest you get.
- Brain fog: difficulty concentrating or feeling mentally sluggish.
- Skin problems: rashes, itching, or unusual coatings on your tongue.
- Frequent cravings: especially for sugar or caffeine.
These may seem “normal,” but they’re often red flags that your immune system needs extra support. The good news? With the right approach, you can turn things around quickly.
The Naturopathic Approach to Boosting Immune Health
A stronger immune system doesn’t come from quick fixes. That’s where naturopathic nutrition excels – it looks at your health holistically, addressing root causes rather than just masking symptoms.
Here’s how it works:
- Personalised nutrition: eating the right foods to fuel your body and strengthen your immune defences.
- Gut health support: balancing your gut bacteria to improve digestion and overall wellbeing.
- Detoxification: clearing out toxins that can weaken your immune system, like mould exposure or poor diet.
- Lifestyle shifts: small changes, such as better sleep and stress management can have a big impact.
By focusing on these key areas, you can give your immune system the tools it needs to thrive – not just in winter but all year round.
My Top Tips to Boost Your Immune System Naturally
1. Reduce Sugar
Sugar is one of the biggest culprits when it comes to weakening your immune system.
Did you know that just six teaspoons of sugar – roughly the amount in one chocolate bar – can reduce the ability of your white blood cells to fight bacteria and viruses by 25% for up to four hours?
Refined carbohydrates, like white rice, bread, and pastries, also turn into sugar quickly in your system, triggering energy crashes, cravings, and mood swings.
Even “sugar-free” versions aren’t much better, as artificial sweeteners can wreak havoc on your gut health. If you’re unsure how your blood sugar levels are holding up, you can take my Health and Energy Quiz for insights. I’ve also written a whole blog on the benefits of reducing sugar which has some tips to help reduce cravings.
2. Start the Day with Protein
Stabilising your blood sugar early in the day sets the tone for steady energy and fewer cravings. Adding protein to your breakfast is key.
If you’re short on time, try making a batch of homemade granola:
- Mix unroasted nuts like walnuts and almonds with melted coconut oil
- Add a teaspoon of cinnamon
- Add a pinch of Celtic or Himalayan salt
- Bake for 10-15 minutes and store for quick, healthy breakfasts paired with yoghurt and berries
3. Optimise Vitamin D Levels
Vitamin D is crucial for a strong immune system, especially in winter when we can’t rely on sunlight to produce enough.
It is very common to have low levels of Vitamin D, even if your tests show “normal” results. I prefer testing levels at around 125 nmol/l, which is within functional medicine’s optimal range. So make sure you take a Vitamin D Test to find out.
You can boost your levels with foods like wild salmon (2-3 times a week max due to mercury content), organic liver (no more than once a week due to the high vitamin A levels), and organic eggs. Vegans may need additional support, check out my guide on How to Be a Healthy Vegan.
Additionally, you can take vitamin D supplements. However, it’s important to understand that not all vitamin D supplements are high quality and easy to absorb, so you may need some guidance on how much to take and in what form to take it.
4. Support Your Gut Health
Your gut is a powerhouse for your immune system, but it needs the right care to function at its best.
A great way to support gut health is by including probiotics in your diet – foods like sauerkraut and kimchi are excellent options. Just be sure they’re labelled as raw or unpasteurised, as processing can kill off the beneficial live bacteria.
If you have compromised digestion, however, introducing probiotics can sometimes be a challenge. Conditions like IBS may require additional support to ensure your gut can handle these beneficial additions.
Probiotics add helpful bacteria to your gut, but they don’t stay there long. Instead, they perform specific jobs to support your overall gut health. To make sure these bacteria can thrive, you also need prebiotics – foods that feed the good bacteria and help them set up a strong foundation.
Prebiotic-rich foods include onions, garlic, Jerusalem artichokes, green tea, and even dark chocolate (the higher the cocoa percentage, the better, as it contains less sugar). It’s a great way to treat yourself without compromising your immune system!
Another key tip is to focus on eating a wide variety of colourful vegetables – aim for about nine portions a day, with at least one from each colour of the rainbow. Most people fall short of this target, so it’s a simple but impactful change to support both your gut and your immune system.
If you find that increasing prebiotic foods or vegetables causes bloating or discomfort, you may need to dig deeper into what’s going on with your digestion (I can help with that).
Immune-Boosting Foods to Add to Your Plate
What you eat plays a huge role in how well your immune system functions. Certain foods are packed with nutrients that support your body’s natural defences, so filling your meals with these can give your immunity the boost it needs.
Protein-Packed Foods
Start your day with protein-rich options like eggs or homemade granola with nuts and seeds. Protein helps build and repair cells, including those in the immune system. To keep your body strong and energised, include organic poultry, fish, or plant-based protein sources such as lentils, chickpeas, and organic tempeh in your main meal.
Fermented Foods
Sauerkraut, kimchi, and kefir are powerful probiotics that help balance your gut microbiome and improve your immune function.
Prebiotic-Rich Vegetables
As for prebiotics, consider onions, garlic, leeks, and Jerusalem artichokes to feed your gut bacteria. Dark chocolate (the higher the percentage of cocoa, the better) also makes the list, as it helps build up your gut bacteria.
Colourful Vegetables and Fruits
Aim for at least nine portions of vegetables a day, focusing on variety and colour. Brightly coloured produce like red peppers, carrots, spinach, and blueberries are full of antioxidants and vitamins that strengthen your immune system.
Vitamin D-Rich Foods
Wild salmon, organic eggs, and liver are great sources of this essential nutrient, which plays a key role in regulating your immune response. If you’re plant-based, consider fortified foods or supplements for support.
Nuts and Seeds
Packed with vitamins, minerals, and healthy fats, nuts and seeds like almonds, sunflower seeds, and walnuts are great for maintaining immune health. They’re also easy to incorporate into snacks or sprinkle onto meals.
Take Control of Your Immune Health
Your immune system is your body’s first line of defence, but it needs the right support to do its job effectively.
By making small, intentional changes – like reducing sugar, adding more protein and colourful vegetables to your plate, and supporting your gut health – you can strengthen your immunity and feel your best, even during the challenging winter months.
Don’t wait until you’re run down to start taking care of your health. I offer a FREE 30-minute digestive rescue call to help. During our meeting, I’ll talk about your health concerns, give you a few easy recommendations to get started, and explain what I do as a gut health naturopath and what the options are.
FAQs About Supporting Your Immune Health
How does exercise boost the immune system?
Regular, moderate exercise improves circulation, which helps immune cells travel through the body more effectively. It also reduces inflammation and lowers stress hormones that can suppress immunity. Try incorporating activities like brisk walking, yoga, or light strength training to keep your body and immune system in top form. Not a good idea when a bug takes hold though, at this time your body needs to rest.
How quickly can I expect to see improvements in my immune system?
This depends on your starting point and the changes you make. Many people notice more energy, fewer infections and better digestion within a few weeks of improving their diet and lifestyle.
