Don’t Let the Sniffles Win: Autumn Nutrition and Training Habits for a Strong Immune System
Don’t let sniffles and scratchy throats bench you this autumn. A few smart tweaks to how you train, eat and recover can make a big difference to how often you get knocked over by colds as the temps drop around the Inner West.
As the mornings cool down and we spend more time indoors with windows shut, viruses like cold and flu spread more easily in workplaces, schools and public transport. Your immune system is constantly patrolling your body with cells like natural killer cells, T-cells and antibodies, and the way you move, eat and sleep either supports those defences or makes their job harder.
The good news is that regular moderate exercise, solid sleep and a balanced diet can reduce your risk of getting sick and may shorten how long you feel ordinary if you do catch something. Autumn is the perfect time to lock those habits in before winter fully hits.
Train smart, not smashed: exercise and immunity
Research is clear: moderate exercise boosts immune function, but going too hard too often can tip things the other way.
Regular moderate activity (like 30–45 minutes of brisk walking, jogging or circuits most days) is linked with fewer colds and better overall immune function.
Each bout of moderate exercise temporarily boosts circulation of key immune cells, helping your body “patrol” for bugs more effectively.
Very intense or long sessions with poor recovery can temporarily suppress some aspects of immunity, which is why endurance athletes often report more colds during heavy training blocks.
What this looks like for Outdoor Squad in autumn:
Aim for 3–5 sessions a week at a “can still talk in short sentences” intensity, not flat-out every day.
Use the cooler air to build consistency and technique instead of chasing PBs every single session.
If you’re doing a harder Squad session (for example hills around Callan Park or Bay Run intervals) follow it with an easier day like a walk or mobility flow.
If you’re already feeling run down or on the edge of a cold, dial back intensity rather than disappearing completely. Light to moderate movement (like an easy walk or very gentle circuit) can still support circulation and mood without over-stressing your immune system.
Sleep and stress: your underrated immune boosters
You can be doing everything “right” in training and food, but if you are chronically sleep-deprived or stressed, your immune system will struggle.
Adults who regularly get less than 7 hours of sleep per night are more likely to catch a cold compared to those sleeping 7–8 hours.
Chronic stress and elevated cortisol over time can blunt immune responses and make you more susceptible to infections.
Simple Inner West-friendly habits:
Aim for a regular wind-down: screens off 30–60 minutes before bed, herbal tea, light stretching.
Lock in a consistent bedtime, especially the nights before early morning Squad sessions.
Use exercise as a stress outlet, but remember that more is not always better; consistency at a moderate level beats occasional all-out punishment sessions.
Even one or two extra hours of good sleep across the week can make a noticeable difference to your energy and resilience heading into colder mornings.
Autumn nutrition foundations for immunity
There is no single “superfood” that will guarantee you avoid colds, but a pattern of eating with plenty of plants, quality protein and healthy fats provides the raw materials your immune system needs to function well.
Focus on whole foods
Aim to build most meals from:
Vegetables and fruit (especially colourful ones) for vitamins, minerals and antioxidants.
Whole grains like oats, brown rice and wholegrain bread for slow-release energy and fibre.
Lean proteins like eggs, Greek yoghurt, fish, chicken, tofu or legumes to support immune cells and muscle repair.
Healthy fats from olive oil, nuts, seeds and avocado for hormone and cell function.
Australian resources recommend a pattern like this to support overall health and immune function, especially across cold and flu season.
Vitamin C: more than just oranges
Vitamin C helps support normal immune function and acts as an antioxidant, and deficiency increases susceptibility to infections, especially respiratory ones. While megadoses will not “cure” a cold overnight, regularly getting enough from food is a smart baseline.
Good autumn-friendly vitamin C sources include:
Citrus fruit (oranges, mandarins, grapefruit)
Kiwi fruit and berries
Capsicum
Broccoli and Brussels sprouts
Some newer research also suggests vitamin C may positively influence the gut microbiome, which is closely tied to immune health, although more studies are needed.
Practical ideas:
Add berries or kiwi to your post-Squad brekkie.
Throw capsicum, broccoli and tomatoes into your pasta sauces and stir-fries.
Keep mandarins or cut fruit at your desk for afternoon snacks instead of just biscuits.
Vitamin D and gut health: sunshine, food and your immune system
Vitamin D is well known for its role in bone health, but it also has important immune-modulating effects and appears to influence the gut microbiome, which is closely linked with immune function. Low vitamin D levels have been associated with poorer immune responses and more inflammation in several conditions.
In autumn, the days are shorter and we tend to cover up more, which can mean less incidental sun exposure. Some vitamin D can be obtained from foods like oily fish, egg yolks and fortified products, although in many adults diet alone is not enough.
Practical steps:
When safe, get short bouts of sun exposure on arms and legs in the middle of the day, balanced with skin cancer precautions.
Include foods like salmon or sardines a couple of times a week, along with eggs and fortified dairy or alternatives.
If you suspect your vitamin D levels are low (for example you are indoors most of the day) talk to your GP about getting a blood test and individual advice.
Look after your gut: fibre and fermented foods
Around 70% of the body’s immune cells are in or around the gut, so what you feed your microbiome matters for immune resilience. Diets rich in fibre and plant diversity are associated with a more diverse and robust gut microbiome, which supports a balanced immune response.
Helpful gut-friendly choices include:
High-fibre foods such as oats, barley, lentils, beans, chickpeas and wholegrain bread.
A variety of vegetables and fruit across the week rather than the same two or three every day.
Fermented foods like yoghurt with live cultures, kefir, sauerkraut or kimchi, if you tolerate them.
Some emerging research suggests vitamins like vitamin D and vitamin C may influence the composition of the microbiome in ways that could support immune function, although this area is still being explored.
A simple habit for busy Inner West adults: build at least half your plate from plants at lunch and dinner, and choose a yoghurt with live cultures as an easy snack or dessert.
Autumn comfort food without the energy crash
Cooler evenings often mean more stews, curries and “comfort” meals. You do not need to ditch these to stay healthy, but a few tweaks will help you feel energised for your next Squad session rather than sluggish.
Base meals around plenty of vegetables and legumes (think veggie-packed soups, lentil curries, chilli with beans).
Choose mostly wholegrain carbohydrates like brown rice, wholegrain pasta or sweet potato to keep energy stable.
Add a decent portion of protein to each meal to help repair muscles and support immune cells.
Example Inner West-friendly combos:
Slow-cooked beef and veggie stew with sweet potato mash.
Chickpea and pumpkin curry with brown rice and a dollop of Greek yoghurt.
Baked salmon with roast veg and quinoa.
If you are training in the early morning, avoid very heavy or greasy dinners right before bed that leave you feeling bloated. Try to finish larger meals at least 2–3 hours before sleep.
Putting it together: a sample “immune-supportive” autumn day
Here is how a realistic day might look for a busy adult doing an early Squad session.
Pre-session (5:30am): Glass of water, small snack if needed (half a banana or a piece of toast).
Squad training (6:00am): Moderate intensity circuit at Sydney Park, where you can still talk in short bursts.
Post-session breakfast: Rolled oats with Greek yoghurt, berries and a sprinkle of nuts for vitamin C, protein, fibre and healthy fats.
Mid-morning: Mandarins and a handful of almonds.
Lunch: Wholegrain wrap with chicken, mixed salad, avocado and a side of vegetable soup.
Afternoon movement: Short walk or mobility break to reduce sitting time and support stress management.
Dinner: Baked salmon or tofu with roasted vegetables and brown rice.
Evening wind-down: Screens off 30 minutes before bed, herbal tea, in bed by a consistent time aiming for 7–9 hours.
This kind of day builds in moderate exercise, a variety of plant foods, quality protein, some healthy fats and decent sleep, all of which support a resilient immune system heading into the cooler months.
When to ease off and when to stay home
Even with great habits, you may occasionally get sick. Knowing when to push through gently and when to rest completely matters.
Mild “above the neck” symptoms like a runny nose and mild sore throat, without fever, may be compatible with light to moderate exercise, though not all-out training.
If you have a fever, chest symptoms, body aches or feel generally wiped out, the advice is to rest and stay home until you are clearly recovering.
Resting properly when you are genuinely unwell helps you recover faster and reduces the chance of spreading illness to your Squad mates.
Putting it to action
Autumn does not have to mean three colds and a missed training block. Support your immune system with sensible training loads, decent sleep, stress management and simple, nutrient-dense food choices, and you hugely improve your chances of staying active through the cooler months.
If you would like a community that helps you keep those habits going, join our Sydney Inner West community and train outdoors with us. Book your free trial session with The Outdoor Squad and let’s help you stay strong, consistent and as sniffle-free as possible this autumn.
