How to Prepare Your Immune System for Cold and Flu Season, Naturally

Every fall, the same pattern shows up in my practice. The weather turns, schedules fill up, and one by one people come in already sick, wishing they'd started taking care of themselves a few weeks sooner.

The good news is that your immune system responds to how you live day to day. You don't need a cabinet full of supplements or a complete lifestyle overhaul. A handful of steady, foundational habits, started now, can help your body meet cold and flu season with more resilience.

Why we get sick more in fall and winter

It's not just the cold air. Several things line up at once:

• Less sunlight means your skin makes less vitamin D, a nutrient your immune cells rely on.

• More time indoors puts us in close contact with others, so viruses spread more easily.

• Dry air from heating can dry out the mucous membranes in your nose and throat, your body's first line of defense.

• Busier, more stressful schedules with school, work deadlines, and the holidays often cut into sleep and good meals.

The habits below work on each of these.

The five foundations of fall immune prep

1. Fill your plate with immune-supporting nutrients

Your immune system relies on a steady supply of nutrients, and food is the best place to get them. A few to focus on this season:

• Vitamin C: citrus, kiwi, bell peppers, broccoli, strawberries, and Brussels sprouts.

• Vitamin D: fatty fish like salmon and sardines, egg yolks, and mushrooms. Since your skin makes vitamin D from sunlight, a midday walk outside helps too, even on cloudy days.

• Zinc: pumpkin seeds, chickpeas, lentils, cashews, oysters and other shellfish, and beef.

• Vitamin A: sweet potatoes, carrots, squash, and dark leafy greens, which help keep the lining of your nose and throat healthy.

• Protein: your body uses it to build antibodies and immune cells, so include some at every meal.

2. Care for your gut

About 70% of your immune tissue lives in and around your gut, so a healthy gut supports a healthy immune system.

• Fermented foods like yogurt, kefir, sauerkraut, kimchi, and miso add beneficial bacteria.

• Fiber from beans, whole grains, vegetables, and seeds feeds those bacteria.

• Variety matters. Try to eat a wide range of plant foods each week.

It also helps to go easy on added sugar and alcohol, both of which can strain your immune system when they become everyday habits.

3. Cook with warming, aromatic foods

Many traditional kitchens lean on the same ingredients during cold months, and they are easy to work into everyday meals:

• Garlic and onions add flavor and have a long history of use during cold season. Let chopped garlic sit for a few minutes before cooking.

• Ginger and turmeric bring warmth to soups, stir-fries, and teas. Pair turmeric with black pepper.

• Mushrooms like shiitake and maitake contain compounds called beta-glucans that interact with immune cells.

• Soups, stews, and bone broth are hydrating, easy to digest, and a simple way to combine all of the above.

4. Make sleep a priority

Sleep is when your body does much of its immune repair. Adults who regularly sleep less than 7 hours are more likely to catch a cold after exposure to a virus.

• Aim for 7 to 9 hours a night.

• Keep the same bedtime and wake time, even on weekends.

• Get morning daylight to anchor your body clock, which helps as daylight saving time ends on November 1.

• Dim screens and bright lights an hour before bed.

• Keep your bedroom cool, dark, and quiet.

5. Manage stress before it manages you

Short bursts of stress are normal. Ongoing stress keeps cortisol elevated, which can weaken your immune response over time. That's one reason people often get sick right after a stressful stretch ends.

Even 10 minutes a day helps:

• A walk outside, ideally in daylight

• Slow breathing, such as inhaling for 4 counts and exhaling for 6

• Journaling or a short gratitude practice

• Time with people who make you feel good

Regular, moderate movement also supports immune function. Aim for activity most days, but rest when you're run down.

Warming teas for the season

A warm mug of tea is hydrating, soothing, and an easy daily ritual. A few favorites for fall and winter:

• Ginger tea: simmer a few slices of fresh ginger in water for 10 minutes. Warming and soothing for the throat and stomach.

• Lemon and honey: warm water with fresh lemon and a spoonful of raw honey. Honey can soothe a cough, but never give it to children under 1 year old.

• Green tea: contains antioxidants and a gentle amount of caffeine, so enjoy it earlier in the day.

• Cinnamon and clove: a cozy, naturally sweet blend that pairs well with apple slices.

• Peppermint: refreshing and helpful for feeling clearer when you're congested.

• Chamomile: a calming choice in the evening to help you wind down for sleep.

Try this: Ginger, lemon, and honey tea. Simmer 1 inch of sliced fresh ginger in 2 cups of water for 10 minutes. Strain into a mug, then stir in the juice of half a lemon and 1 teaspoon of raw honey once it has cooled slightly.

Some herbal teas aren't suitable during pregnancy or alongside certain medications, so check with your provider if you're unsure.

Supplements we love for immune support

Food and daily habits come first. For extra support during cold and flu season, these are some of the supplements we like to use to support the immune system:

• Bio-Vegetarian (Priority One): a daily blend of vitamins A and C, zinc, and bioflavonoids with echinacea, garlic, ginger, Oregon grape, and barberry to support healthy immune function.

• Virocid: [add a short description of the formula and its key ingredients]

• EHB (Integrative Therapeutics): combines vitamins A, C, and B6 and zinc with echinacea, goldenseal, garlic, licorice, and bromelain to support the body's natural immune response.

• ViraCon (Vital Nutrients): an herbal blend of elderberry, astragalus, propolis, Chinese skullcap, licorice, and St. John's wort, with zinc, to support immune and respiratory health.

• Liposomal C: vitamin C wrapped in tiny fat-based spheres called liposomes, which may help your body absorb more of it than standard vitamin C.

These formulas aren't right for everyone. Several contain herbs that can interact with medications. St. John's wort in ViraCon, for example, can make birth control, antidepressants, and other prescriptions less effective. Some aren't recommended during pregnancy or nursing, with autoimmune conditions, or alongside blood thinners. Please check with us or your doctor before starting any of them to ensure it is a good fit for you.

If you do get sick:

Even with great habits, you may still catch something. When you do, give your body what it needs to recover:

• Rest. Stay home, cancel what you can, and sleep as much as your body asks for.

• Hydrate. Warm water, herbal teas, and broth all count. Honey in tea can soothe a cough in adults and children over 1 year old.

• Eat simply. Soups and stews are easy to digest and nourishing.

• Use steam and saline. A hot shower, a humidifier, or a saline rinse can ease congestion.

Small habits, steady results

You don't have to do everything on this list at once. Pick one or two habits that feel doable, like a pot of soup each week or a cup of ginger tea in the afternoon, and build from there. Consistency over the coming months matters more than perfection.

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This article is for educational purposes only and is not a substitute for individual medical advice, diagnosis, or treatment. Please talk with your healthcare provider before making changes to your diet or routine, especially if you are pregnant, nursing, managing a health condition, or taking medications.

Immune Boosting Recipes

Golden coconut squash soup with crispy chickpeas

Serves 4. Ready in about 45 minutes.

This silky, Thai-inspired soup brings together some of fall's best immune-supporting foods. Butternut squash is rich in vitamin A, ginger and turmeric add warmth, lime adds a bright hit of vitamin C, and the crispy chickpeas and pumpkin seed topping add zinc and a satisfying crunch.

For the soup

• 1 tbsp coconut or olive oil

• 1 yellow onion, diced

• 4 cloves garlic, minced

• 2 tbsp fresh ginger, grated

• 1 stalk lemongrass, bruised and cut in half (optional)

• 1 tbsp Thai red curry paste

• 1 tsp ground turmeric and a pinch of black pepper

• 1 medium butternut squash (about 2 lbs), peeled and cubed

• 1 large carrot, chopped

• 3 cups vegetable or chicken bone broth

• 1 can (13.5 oz) full-fat coconut milk

• Juice of 1 lime

• Sea salt to taste

For the crispy chickpeas and toppings

• 1 can (15 oz) chickpeas, drained, rinsed, and patted dry

• 1 tbsp olive oil

• 1/2 tsp smoked paprika and 1/2 tsp cumin

• Toasted pumpkin seeds, fresh cilantro, and a drizzle of coconut milk to finish

Instructions

1. Heat the oven to 425°F. Toss the chickpeas with olive oil, paprika, cumin, and a pinch of salt. Roast on a baking sheet for 25 to 30 minutes, shaking halfway, until crisp.

2. Meanwhile, warm the oil in a large pot over medium heat. Cook the onion for 5 minutes until soft.

3. Add the garlic, ginger, curry paste, turmeric, and pepper. Stir for 1 minute until fragrant.

4. Add the squash, carrot, lemongrass, and broth. Bring to a boil, then simmer for 20 minutes until the squash is tender.

5. Remove the lemongrass. Stir in the coconut milk, then blend until smooth with an immersion blender or in batches in a regular blender.

6. Stir in the lime juice and season with salt.

7. Ladle into bowls and top with crispy chickpeas, pumpkin seeds, cilantro, and a swirl of coconut milk.

Tip: Curry pastes vary in heat, so start with less and add more to taste. Leftovers keep in the fridge for up to 4 days; store the chickpeas separately so they stay crunchy.

Sheet-pan maple ginger salmon with sweet potatoes and broccoli

Serves 4. Ready in about 35 minutes

One pan, minimal cleanup. Salmon is one of the few foods naturally rich in vitamin D, sweet potatoes bring vitamin A, and broccoli adds vitamin C.

Ingredients

• 4 salmon fillets (about 5 oz each)

• 2 medium sweet potatoes, cut into 1-inch cubes

• 1 large head broccoli, cut into florets

• 2 tbsp olive oil

• Sea salt and black pepper

• For the glaze: 2 tbsp maple syrup, 2 tbsp tamari or soy sauce, 1 tbsp fresh grated ginger, 2 cloves minced garlic, and the juice of 1/2 lemon

• Sesame seeds and sliced green onion to finish

Instructions

1. Heat the oven to 425°F. Toss the sweet potatoes with 1 tbsp olive oil, salt, and pepper. Roast on a large sheet pan for 15 minutes.

2. Whisk together the glaze ingredients.

3. Push the sweet potatoes to the sides. Add the broccoli tossed in the remaining oil, and place the salmon in the center. Brush the salmon with half the glaze.

4. Roast for 12 to 15 minutes, until the salmon flakes easily.

5. Drizzle with the remaining glaze and top with sesame seeds and green onion.

Sunrise citrus smoothie

Serves 1. Ready in 5 minutes.

A bright breakfast or afternoon pick-me-up. Citrus and kiwi provide vitamin C, kefir adds gut-friendly probiotics, and pumpkin seeds add zinc.

Ingredients

• 1 orange, peeled

• 1 kiwi, peeled

• 1/2 cup frozen mango

• 1 handful spinach

• 3/4 cup plain kefir or yogurt

• 1/2 inch fresh ginger, peeled

• 1 tbsp pumpkin seeds

• Splash of water or coconut water to blend

Instructions

1. Add everything to a blender.

2. Blend until smooth, adding more liquid if needed.

3. Pour and enjoy right away.