
Winter Immunity: The Nutrients That Really Work
You may notice that as soon as all the kids are back in school, everyone is coming down with something. Or, you might find that every year when you finish work for Christmas, you all come down with the flu. Why is this happening? And what can we do about it?
When the weather turns colder, shorter daylight hours can leave many of us feeling completely run down. You may find yourself catching more colds, feeling more tired, or noticing that your gut feels more unsettled - all of which can affect our immune resilience.
The good news is that there are things we can do with our food that can strengthen our body’s defences. This blog explores why immunity tends to decline in winter and which nutrients have the strongest scientific backing for supporting immune health.
Why Immunity Declines in Winter
There are several reasons why winter puts extra pressure on your immune system.
Reduced sunlight and vitamin D synthesis
From October to March in the UK, the sun’s rays are too weak for the skin to produce enough vitamin D. The process depends on ultraviolet B (UVB) light converting a cholesterol compound in the skin (7-dehydrocholesterol) into vitamin D3. So, winter is a time of year when the sun is low in the sky and people are spending more time indoors, therefore production effectively shuts down.
Research shows that average vitamin D levels fall steadily through winter and early spring. This is a particular issue for people with darker skin tones, because higher levels of melanin reduce the skin’s ability to synthesise vitamin D from sunlight. People of South Asian, African, or Caribbean heritage are therefore at higher risk of deficiency in the UK climate, and maintaining good status often requires dietary supplementation. Older adults, people who cover their skin for cultural or medical reasons, or those with gut absorption issues are also more likely to have low vitamin D.
More time indoors
As temperatures drop, we spend more time inside in close proximity to others.
This makes it easier for respiratory viruses to spread, especially when windows are closed and air circulation is poor. Cold, dry air may also help viruses survive longer in the environment.
Lifestyle and digestive changes
Shorter days can disrupt sleep and mood, both of which directly influence gut motility and digestive secretions through the gut–brain axis. Reduced sunlight lowers serotonin levels, and since serotonin helps regulate intestinal movement, this can slow digestion and may lead to bloating or constipation.
People often move less and drink less water in winter, which reduces the mechanical stimulation of the gut and slows peristalsis. Colder weather can also shift food choices toward heavier, starchier meals and fewer fresh fruits and vegetables, reducing fibre intake and microbial diversity.
Meanwhile, chronic low-grade stress – common during darker months – can activate the sympathetic nervous system thereby suppressing the “rest and digest” parasympathetic response. This leads to lower stomach acid and digestive enzyme secretion, which can reduce nutrient absorption. Together, these factors make digestion feel slower and less efficient, particularly in those already prone to gut symptoms.
And, because around 70% of immune cells are located in or around the gut wall, any disruption to digestion and gut barrier function can weaken immune regulation, leaving the body more vulnerable to infection and inflammation.
Key Nutrients for A Resilient Immune System
But it’s not all bad news! There are several things that we can do to support our immune system over these cold, wintry months. Here are the most evidence-based:
Vitamin D and Immune Defence
Vitamin D acts more like a hormone than a vitamin, influencing over 200 genes, many of which are involved in immune regulation.
Immune cells carry vitamin D receptors, allowing vitamin D to influence how they behave. It helps maintain the integrity of epithelial barriers (such as the linings of the lungs and the gut), encourages the production of antimicrobial peptides that directly fight pathogens, and supports a balanced immune response - strong enough to defend, but not so strong that it triggers excess inflammation.
Why winter matters
During the darker months, vitamin D synthesis from sunlight is negligible across the UK. Dietary sources are limited, and deficiency is common in people who spend little time outdoors or have darker skin. Low levels have been linked with increased susceptibility to respiratory infections and slower recovery.
While research findings are mixed, studies consistently show that those who start winter with low vitamin D tend to benefit most from supplementation. The evidence suggests that steady, daily doses are more effective than occasional high doses. In the UK, public health guidance recommends everyone take a 10 µg (400 IU) daily vitamin D supplement between October and March, with some people needing higher amounts under clinical supervision.
Zinc
Zinc is critical for the development and activity of immune cells. It helps regulate inflammation, supports wound healing, and is essential for maintaining the integrity of the skin and mucous membranes - our first physical barriers to infection.
Even mild zinc deficiency can impair immune function. Several randomised controlled trials have shown that zinc lozenges, when taken within 24 hours of the onset of cold symptoms, can shorten duration by a few days. The effect depends on the formulation and dose: lozenges that provide more than 75 mg elemental zinc per day, taken for short periods, appear most effective.
Good dietary sources include shellfish, beef, lamb, cheese, pumpkin seeds, and wholegrains. Because high intakes can interfere with copper absorption, long-term supplementation should not be done without supervision.
Vitamin C
Vitamin C is one of the body’s main antioxidants and plays an essential role in immune defence. It supports the function of white blood cells, enhances the activity of natural killer cells, and protects immune cells from oxidative stress during infection. It also helps maintain the integrity of those epithelial barriers, including the gut and lungs.
While daily supplementation with vitamin C does not seem to prevent colds in the general population, it can modestly reduce their duration and severity. People under physical stress, such as athletes or those with higher oxidative load, may benefit more.
Regular intake of vitamin C-rich foods - citrus fruits, kiwi, berries, peppers, and cruciferous vegetables - remains the best approach for most people.
Selenium
Selenium is a trace mineral needed to produce selenoproteins, enzymes that protect immune cells from oxidative damage. It helps control inflammation, supports the production of antibodies, and assists in the clearance of pathogens.
In regions with low selenium soil levels, such as parts of Europe, sub-optimal intake may be more common. Deficiency has been associated with reduced immune responses and more severe infections.
Most people can maintain good levels by eating selenium-rich foods such as Brazil nuts (just one or two per day), eggs, tuna, sardines, and wholegrains.
Probiotic foods and the Gut–Immune Axis
Around two-thirds of immune activity originates in or around the gut. The gut microbiota plays a vital role in training and regulating immune responses. When the balance of gut bacteria is disrupted, for example, after antibiotics or periods of high stress, the immune system can become either sluggish or over-reactive.
Several meta-analyses have found that specific probiotic strains can reduce the risk or duration of upper respiratory tract infections, particularly in children and older adults. Benefits are strain-specific and depend on regular intake.
Fermented foods such as live yoghurt, kefir, sauerkraut, and kimchi can contribute to microbial diversity. Always check with a nutritionist before embarking on probiotic supplementation, as it is important to pick the right strain.
Everyday Food Sources of Immune Nutrients
You can support immune resilience through simple, whole-food choices:
For those of us with gut symptoms, make sure to introduce higher-fibre or fermented foods gradually and support digestion with mindful eating and adequate hydration.
If you find that you’re frequently run down in winter or struggle with fatigue and gut symptoms, it may be time to review your nutrient intake and gut–immune balance. Book a free 30-minute call with me, and we can talk through options to support your energy, gut health, and immune strength through the colder months.

Diabetes - What You Should Know About Diagnosis & Prevention
Every November, Diabetes Awareness Month highlights one of the UK’s fastest-growing health challenges. More than 5.8 million people in the UK are living with diabetes, and an estimated 850,000 remain undiagnosed (Diabetes UK, 2024).
Understanding the condition, recognising the signs, and knowing when to speak to your GP can make a real difference to long-term health.
What Is Diabetes?
Diabetes is a condition where blood sugar (glucose) levels become too high because the body can’t use insulin effectively or doesn’t produce enough of it.
T2D is the most common form, and its onset is often gradual. Many people live with pre-diabetes (also known as non-diabetic hyperglycaemia) for years without knowing.
Unchecked, high blood sugar can lead to complications such as heart disease, nerve damage, eye or kidney issues, which is why early detection and preventive lifestyle steps are so important.
How Your GP Tests for Diabetes
If you notice frequent thirst, increased urination, tiredness, blurred vision or slow-healing wounds, it’s worth discussing these symptoms with your GP.
Typical UK diagnostic tests include:
If results are raised but below diabetic range, you may be told you have pre-diabetes and offered monitoring or referral to the NHS Diabetes Prevention Programme (NDPP).
The UK National Screening Committee currently does not recommend universal screening for type 2 diabetes, but GPs are encouraged to test those with risk factors such as family history, high blood pressure, or overweight (UK NSC 2023).
Can Type 2 Diabetes Be Hereditary?
Yes, genetics can influence your risk, but it’s not destiny. Having a close relative (parent, brother or sister) with type 2 diabetes increases your likelihood two- to six-fold compared with someone without that history (Diabetes UK, 2023). This happens because genes affecting insulin production and glucose metabolism can be inherited, but environment and lifestyle still play the largest role.
Regular activity, balanced eating, maintaining a healthy waist circumference, and not smoking all help offset this inherited risk.
Evidence That Prevention Works
Strong UK evidence shows that type 2 diabetes can often be delayed or even prevented:
Lifestyle Strategies Beyond Nutrition
While food choices are key, several other areas influence blood sugar and metabolic health:
1. Movement and Exercise
Even modest daily activity improves how muscles use glucose. Both aerobic exercise (like brisk walking or cycling) and strength training enhance insulin sensitivity.
Breaking up long periods of sitting is also beneficial. Weight training is essential to helping improve insulin sensitivity too.
2. Sleep Quality
Consistently getting less than seven hours’ sleep can impair glucose control.
Prioritise a regular bedtime, reduce evening screen time, and keep the bedroom dark and cool.
3. Stress Management
Chronic stress raises cortisol, a hormone that can elevate blood sugar.
Mindfulness, deep breathing, time in nature, or supportive conversations all help moderate stress responses.
4. Weight and Body Composition
Even a 5–10 % reduction in body weight can significantly improve blood sugar control. Focus on building muscle through gentle resistance exercise and balanced protein intake.
5. Regular Check-ups
For those living with diabetes, the annual review offered by the NHS includes checks for HbA1c, blood pressure, cholesterol, kidney and foot health, all vital for preventing complications (NHS Diabetes Care Processes, 2024).
For everyone else, periodic health checks for blood pressure, waist circumference, and glucose levels can help spot early warning signs.
Taking Action This Diabetes Awareness Month
Diabetes prevention isn’t about perfection - it’s about awareness and steady change. This November, consider booking a routine health check, reviewing your lifestyle habits, and learning more about how small steps protect long-term health.
Explore related topics in:
If you’d like personalised support to improve your energy and metabolic health, book a Blood Sugar Balance Consultation.
Disclaimer: This blog is for general educational purposes only and should not replace medical advice. Always consult your GP or healthcare provider before making changes to your diet, medication or lifestyle.

Autumn One Pot Wonder
As the weather turns cooler, there’s something deeply satisfying about a warming one-pot meal. Especially when it’s rich in fibre, packed with seasonal veg, and balanced with enough protein to keep you full for all day.
This recipe delivers around 30 g of protein and over 10 g of fibre per serving. It’s simple to prepare, freezes really well, and works beautifully with autumn ingredients like carrots, swede, kale and leeks.
Why Fibre and Protein Keep You Fuller Longer
Fibre slows the rate at which food leaves the stomach, helping to regulate blood sugar and prevent energy crashes. Protein adds staying power by moderating appetite hormones such as ghrelin.
Serves 2
You can make either the beef or vegetarian version using the same base.
Base Ingredients (for both versions)
Beef Version
Method
Veggie Version
Method
Swaps for Seasonal Flexibility
For more balanced, real-food recipes, visit the Recipe Index.

Ultra-Processed Foods: The Hidden Driver of Weight Gain and Low Energy
Have you ever felt that certain foods actually make you hungrier, less energised, or more prone to snacking? You are not imagining it! The modern food environment is dominated by ultra-processed foods - or UPFs - and they’re quietly influencing how we eat, how full we feel, and how our metabolism functions.
Recent public attention, including Dr Chris van Tulleken’s book Ultra-Processed People and BBC documentary work, has helped reveal what some scientists have known for years: diets high in UPFs are strongly linked to weight gain, poor blood sugar control, and rising rates of metabolic disease.
What Counts as Ultra-Processed?
The term ultra-processed food comes from the NOVA classification, a system developed by Brazilian researchers to categorise foods based on how much they’ve been changed from their original form.
UPFs typically include products made mostly or entirely from industrial ingredients, such as refined starches, oils, sweeteners, flavour enhancers and emulsifiers, with little or no recognisable whole food remaining.
Examples include:
They’re designed to be convenient, tasty and affordable, but they’re also engineered to keep us coming back for more!
How UPFs Affect Blood Sugar and Cravings
UPFs are often rapidly digested and low in fibre, which causes quick spikes in blood sugar and insulin. These sharp rises are usually followed by a sudden drop, leaving you tired, hungry and craving something sweet or starchy again a few hours later.
In a landmark study at the U.S. National Institutes of Health, participants who ate an ultra-processed diet for two weeks consumed around 500 extra calories per day compared to those on a minimally processed diet, despite being offered the same foods in terms of calories, salt and macronutrients. They didn’t mean to overeat; the texture, speed of eating, and reduced satiety simply made it happen.
As van Tulleken points out, many UPFs are “food-like products” that activate the brain’s reward centres more powerfully than traditional foods. This makes moderation difficult, especially when you’re busy, tired or stressed.
The Link Between UPFs and Weight Gain
While no single food causes weight gain on its own, diets dominated by ultra-processed foods are strongly associated with higher body weight, insulin resistance, and metabolic syndrome. The combination of high energy density, poor nutrient quality, and altered appetite signalling creates a perfect storm for metabolic stress.
Long-term studies have linked high UPF intake with an increased risk of type 2 diabetes, heart disease, depression and even premature death. These effects aren’t just about calories, they relate to how UPFs disrupt hormones such as insulin, ghrelin and leptin, which control appetite and fullness.
Why UPFs Are Hard to Avoid
Around 60% of the average UK diet now comes from UPFs, making avoidance almost impossible. They’re absolutely everywhere - in workplaces, cafés, and supermarkets - marketed as “healthy” or “low-fat”, but often loaded with artificial sweeteners, additives, emulsifiers, or refined grains.
For many clients I see, this leads to confusion and frustration: “I’m eating low-fat yoghurt and wholegrain cereal, so why do I still feel tired and hungry all the time?” The answer often lies in food quality and processing level, not the calorie content.
Simple, Sustainable Food Swaps
Completely cutting out UPFs isn’t realistic for most people and it doesn’t have to be. The aim is to shift the balance towards more whole, minimally processed foods that keep blood sugar stable and support energy and mood.
A few easy swaps:
These small changes add up quickly, improving satiety and naturally reducing cravings, without the need for restriction or “detoxing”.
If you’re curious about how to reduce UPFs in your diet, but worried about the cost, check out my blog, Eat Well, Spend Less for more info.
For practical meal inspiration, visit the recipe section of the blog page for balanced, easy-to-prepare dishes that use real, nutrient-dense ingredients.
Next Steps
Reducing ultra-processed foods isn’t about perfection, it’s about awareness. Understanding how they affect your metabolism and mood allows you to make better choices, even in small steps.
If you’d like ongoing support, recipe ideas and tips for sustainable eating, join my free, private Facebook group where I share regular insights to help you build lasting habits for longterm health and wellbeing.
Disclaimer: This blog is for general educational purposes only and is not a substitute for medical advice. Please consult your GP or healthcare provider before making changes to your diet, supplements or medication.

Insulin Resistance and Midlife Weight Gain: Why Blood Sugar Balance Matters
If you feel like you’re doing everything right, but your energy still dips mid-afternoon or the scales won’t budge, insulin resistance could be playing a role. It’s one of the most overlooked factors in midlife weight gain and fatigue, but it’s also one that can respond really well to nutrition and lifestyle changes.
What Is Insulin Resistance?
Insulin is a hormone made by the pancreas that helps move glucose (sugar) from your bloodstream into your cells, where it’s used for energy. Over time, especially when the diet is high in refined or ultra-processed foods, your cells can become less responsive or deaf to insulin’s signal. The pancreas compensates by producing more insulin, but chronically high insulin can encourage fat storage, particularly around the middle, and lead to erratic energy and cravings.
Insulin resistance is increasingly common in our 40s and 50s. It isn’t a disease, but a sign that the body’s metabolism needs support. The earlier it’s addressed, the easier it is to rebalance.
Signs and Symptoms to Watch For
Insulin resistance often develops gradually and can go unnoticed for years. Common indicators include:
These symptoms don’t diagnose insulin resistance but can indicate that your blood sugar regulation needs support. Discuss any concerns with your GP and request appropriate testing if needed.
How Nutrition Can Support Insulin Sensitivity
Nutrition plays a central role in how our cells respond to insulin. Meals that combine protein, fibre and healthy fats slow the release of glucose into the bloodstream, helping to keep energy levels steady and reduce cravings.
For most people, this isn’t about cutting out all carbohydrates, it’s about choosing the right ones. Whole, minimally processed foods with natural fibre and texture support both blood sugar balance and gut health.
Lifestyle factors matter too. Regular movement, particularly strength or resistance training, encourages muscles to absorb glucose more efficiently. Prioritising sleep and managing stress can also prevent the cortisol spikes that make blood sugar harder to control.
If you’d like to explore how these principles apply to midlife, read my related post on Balancing Blood Sugar in Midlife.
Foods That Improve Insulin Response
A few small dietary shifts can have a big impact on insulin sensitivity and overall metabolic health:
A balanced plate might look like grilled salmon with quinoa and broccoli - a simple, nutrient-dense combination that supports steady energy and hormone balance - see image above.
Taking the Next Step
If sugar cravings, fatigue or weight gain feel familiar, it may be time to look beyond willpower and consider what’s might be happening with your blood sugar balance.
Addressing insulin resistance early can transform energy levels, appetite regulation and long-term metabolic health.
You can learn more about building Metabolic Resilience in my post here or book a Blood Sugar Balance Consultation to explore personalised nutrition and lifestyle strategies that work for you.
Disclaimer: This blog is for general educational purposes only and is not a substitute for medical advice. Please consult your GP or healthcare provider before making changes to your diet, supplements or medication.

My Top Tips to Balancing Blood Sugar in Midlife
Many of my clients notice their energy, appetite and weight begin to shift around perimenopause and menopause. Even if your diet hasn’t changed much, you may feel more tired, experience stronger cravings, or find that weight gathers more easily around your middle. And all those tricks that you used to use to drop half a stone don’t work anymore.
This often links back to changes in blood sugar regulation. Hormonal shifts during menopause can affect how your body responds to carbohydrates and insulin, making it harder to maintain steady energy. The good news is that simple, food-first strategies can make a big difference.
Why Blood Sugar Balance Matters During Menopause
Blood sugar (glucose) is your body’s main source of fuel. After eating, glucose from carbohydrates enters your bloodstream, and the hormone insulin helps move it into your cells for energy.
During perimenopause and after menopause, lower oestrogen levels can make the body less sensitive to insulin. This means glucose stays in the bloodstream for longer, and the body may release more insulin to compensate. Over time, this can lead to energy crashes, increased fat storage, and higher risk of type 2 diabetes and heart disease.
Supporting blood sugar balance helps reduce these risks while improving daily energy, focus and mood.
How to Spot Imbalances
Recognising the signs of blood sugar swings can help you spot when you might need to make adjustments.
Cravings, Energy Crashes and Weight Gain
Common signs include:
These symptoms can have other causes too, so it’s important not to self-diagnose – always check with your GP if something is off. But if they sound familiar, it can be worth experimenting with blood sugar-balancing strategies and monitoring how you feel.
Simple Nutrition Strategies for Steady Energy
The goal is to keep blood sugar levels gently rising and falling through the day, rather than spiking sharply and then crashing. A few small changes to your meals and eating habits can help.
Here are my top tips to balancing your blood sugar:
Include protein at every meal
Protein slows the release of glucose from food, helping you feel fuller for longer. Aim for 20–30g per meal. Good sources include fish, poultry, eggs, dairy, tofu, tempeh, lentils, beans, nuts and seeds.
Add fibre and healthy fats
Fibre-rich foods like vegetables, fruit, legumes, nuts and seeds help regulate glucose release and support gut health. Healthy fats from olive oil, avocado, nuts and seeds also slow digestion and improve satiety.
Choose whole, minimally processed carbohydrates
Swap refined carbs like white bread, pastries and sugary snacks for veggie alternatives like courgetti, cauliflower rice, or mashed celeriac. These release glucose more gradually.
Balance your plate
As a simple visual guide, aim to fill half your plate with non-starchy vegetables, a quarter with protein, and a quarter with wholegrain or starchy vegetables. Include a small portion of healthy fat such as olive oil or avocado.
Eat three meals a day, no snacks
Spacing those three meals every within a 12-hour window helps maintain steady energy. Grazing all day can keep insulin levels raised, while skipping meals may lead to big spikes and crashes later. This will also give you a lovely 12-hour overnight fast.
Be mindful with caffeine and alcohol
Too much caffeine on an empty stomach can spike cortisol and blood sugar, while alcohol can cause unstable blood sugar overnight. Try to pair caffeine with food and keep alcohol within recommended limits.
Move your body
Even a short walk after meals can help lower blood glucose levels by encouraging muscles to use glucose for energy. Strength training supports insulin sensitivity and helps preserve muscle, which naturally declines with age.
What next?
Blood sugar balance is one of the most impactful areas to focus on in midlife. It can help reduce cravings, stabilise energy and support healthy weight management - all while lowering the long-term risk of diabetes and heart disease.
Start by making small, sustainable changes to your meals, such as adding more protein and fibre, choosing wholegrains, and spacing meals evenly through the day. These shifts can have a powerful effect on how you feel, think and move through daily life. And if you want to know more about how to put this into practice, why not get in touch?
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Please get in touch and find out more - I offer a free 30-minute exploratory call.