The chill has officially arrived, that subtle reminder that cozy socks, soup season, and yes, cold season are all back in rotation.😪 As temperatures drop, our bodies adjust to new rhythms, including slower mornings, darker evenings, and a bit more time spent indoors. It’s the perfect time to focus on supporting one of your body’s hardest-working systems: your immune system.

We come into contact with bacteria and viruses regularly, but most of the time, we don’t even notice. That’s because our immune system is quietly working behind the scenes to keep us healthy. Like any system, it functions optimally when supported by a balanced diet, adequate rest, regular physical activity, and effective stress management. In today’s blog, we’ll explore how the immune system functions and offer simple, evidence-based ways to keep it strong throughout the fall (and beyond). Let’s explore our seasonal strengths and discover simple ways to support your immune health this fall.🍂

What Is the Immune System?

The immune system is a complex network of organs, tissues, and cells that helps protect your body from bacteria, viruses, fungi, and parasites (1, 2, 3). Think of it as your personal security detail, identifying threats, stopping them at the door, and cleaning up any mess they leave behind. 🚨

In addition to fighting infections, the immune system helps destroy damaged cells, promotes healing after illness or injury (1), and learns from past encounters to respond more efficiently the next time (1, 4).

Immune resilience naturally shifts with age, hormonal changes (hello, menopause!), and stress, making now the perfect time to give it some extra care.🫶🏽

How Does the Immune System Work?

Your immune system knows which cells belong to you and which don’t. When it detects something foreign, such as a virus, it launches an attack. Once the threat is eliminated, the system calms down and enters repair mode. It even creates “memory cells” to recognize the same invader next time (1).

If the immune system becomes too weak, you’re more likely to get sick (1). However, if it becomes overactive, it can misfire, attacking healthy tissue and leading to autoimmune or inflammatory issues (1, 2). The goal is to balance a calm, alert system that reacts when it should and rests when it can (mentally and physically, right?!🤪)

How Can You Support Your Immune System?

Here are daily habits that can help keep your immune system strong (1, 3, 4, 5, 6), and go hand-in-hand with our health goals:

• Eating a balanced Mediterranean diet
• Staying active
• Maintaining a healthy weight
• Getting enough sleep
• Managing stress
• Avoiding tobacco
• Limiting alcohol
• Staying up to date on vaccines
• Practicing good hand hygiene
  

Eat a Healthy, Seasonal Diet

A balanced diet rich in fruits, vegetables, whole grains, and lean proteins provides your immune system with the necessary nutrients to function effectively (1,5). Autumn is a wonderful season to lean into warming, seasonal foods, like roasted root vegetables, hearty soups, and citrus fruits.

These foods offer antioxidants, fiber, vitamins, and minerals that not only support immunity but also help regulate inflammation, balance energy levels, and maintain hormonal health, all of which are essential for women navigating menopause or managing midlife weight changes. (4)

Most people do not need supplements if they eat a healthy diet. However, zinc may be helpful at the beginning of a respiratory infection (4). As always, check with your healthcare provider before starting any new supplement. 

Here are some immune-supportive foods to include in your diet regularly. However, keep in mind that a variety of foods work together to support your immune health, not just one “superfood.” (6,7):

Citrus Fruits 🍊

Oranges, grapefruit, lemons, and limes are rich in vitamin C, which supports white blood cell function (3, 6, 8).

Berries 🍓

Packed with antioxidants and fiber, berries like blueberries and raspberries help regulate blood sugar and support gut health (3, 6, 8).

Broccoli and Leafy Greens 🥦

Broccoli, kale, and spinach provide vitamins A, C, and E, along with phytonutrients such as sulforaphane, which reduce inflammation and support detoxification (7, 8).

Spices: Garlic, Ginger, and Turmeric 🌿

Garlic’s allicin helps immune cells perform their job, while ginger and turmeric combat inflammation and may reduce joint pain, a condition that many women experience more frequently during the colder months or menopause (3, 6, 7, 8).

Yogurt 🥣

A healthy gut means a stronger immune system. Choose low-fat, no-added-sugar varieties for optimal support of probiotics and vitamin D (3, 6, 7).

Nuts and Seeds 🌰

Almonds, sunflower seeds, and walnuts are rich in vitamin E, selenium, and magnesium, excellent nutrients that help balance immune activity and inflammation (3, 7, 8).

Fatty Fish 🐟

Salmon, tuna, and trout are rich in omega-3 fatty acids, which support immune health, brain function, and heart health, all of which are crucial for women during and after menopause (3, 7).

Move Your Body (Even When It’s Cold Out)

Exercise doesn’t just boost your mood, it boosts your immune system, too.  (1). Regular physical activity supports blood sugar control, metabolism, and mental well-being (4, 5).

If hitting the gym feels daunting on chilly mornings, try a brisk walk after lunch, stretch at your desk, or use light weights at home. The U.S. Department of Health and Human Services recommends at least 150 minutes of moderate-intensity activity (such as walking) per week, plus strength training exercises twice a week (9). Even small movements count; the goal is consistency, not perfection.

Sleep, Stress, and Other Lifestyle Factors

Sleep: Your immune system resets while you rest, so aim for 7-9 hours per night (1, 3, 4, 5, 6).

Stress: Chronic stress can weaken immune defenses and increase inflammation (4). Even five minutes of deep breathing or meditation can make a difference (3, 6). Find Your Calm – one of my favorites.

Limit Alcohol and Avoid Smoking: Both can impair your body’s ability to fight infections (1, 3, 4, 5).

Hydrate: Cooler weather can be surprisingly dehydrating. Warm teas, such as those with ginger or green tea, can help hydrate while offering antioxidant benefits.

Support a Healthy Weight: Maintaining a healthy weight helps your immune system function optimally. Excess body fat, particularly around the midsection, can exacerbate inflammation and hinder the immune system’s ability to respond effectively (1, 5). Focusing on balanced meals, regular physical activity, quality sleep, and stress management supports both your metabolism and immune health (5).

Final Thoughts

Your immune system is working for you every minute of the day, whether you’re fighting off a virus, healing from a workout, or simply adjusting to the change in seasons. Supporting it doesn’t mean doing everything perfectly; it’s about consistent, simple habits that make your body more resilient.

This fall, try adding one immune-boosting food to your meals, swap your afternoon coffee for a green tea, or take an extra brisk walk at the end of the day. Small, steady steps can make a significant impact, especially when hormones, metabolism, and energy can feel unpredictable.

Your immune system and your future self will thank you. 💛💛

Need help making lifestyle changes to improve your immune health? Let’s create a personalized plan that works for you!

👉 Book a Discovery Call Here!

References

1. Cleveland Clinic. (2023, October 20). Immune system. https://my.clevelandclinic.org/health/body/21196-immune-system
2. Johns Hopkins Medicine. (n.d.). The immune system. https://www.hopkinsmedicine.org/health/conditions-and-diseases/the-immune-system 
3. Brown University Health. (2022, July 5). Foods to boost your immune system. https://www.brownhealth.org/be-well/foods-boost-your-immune-system
4. Columbia University Irving Medical Center. (2023, October 20). What you really need to do to boost your immunity. https://www.cuimc.columbia.edu/news/what-you-really-need-do-boost-your-immunity
5. Christ A, Lauterbach M, Latz E. Western Diet and the Immune System: An Inflammatory Connection. Immunity. 2019 Nov 19;51(5):794-811. doi: 10.1016/j.immuni.2019.09.020. PMID: 31747581.
6. UCLA Health. (2024, March 19). 5 ways to boost your immunity. https://www.uclahealth.org/news/article/5-ways-boost-your-immunity
7. Cleveland Clinic. (2022, December 30). 11 foods that boost your immune system. https://health.clevelandclinic.org/food-to-boost-your-immune-system
8. Singh, D.N., Bohra, J.S., Dubey, T.P., Shivahre, P.R., Singh, R.K., Singh, T., & Jaiswal D.K. (2023). Common foods for boosting human immunity: A review. Food Science & Nutrition, 11(11), 6761-6774. https://doi.org/10.1002/fsn3.3628.
9. Centers for Disease Control and Prevention. (2024, April 16). What you can do to meet physical activity recommendations. https://www.cdc.gov/physical-activity-basics/guidelines/index.html