Understanding Your Immune System
Your immune system is your body’s primary line of defense, protecting it from harmful microorganisms, formally known as pathogens, such as viruses, bacteria, fungi, and parasites. These microscopic invaders are constantly present in our environment, and although many are harmless, others have the potential to cause infections and disease. Without an effective immune response, your body becomes more susceptible to these threats, increasing the risk of serious illness and, in severe cases, death.
Various components make up the immune system, including white blood cells (such as T cells, B cells, and macrophages), the lymphatic system, and organs such as the spleen. Each component plays a specific role in identifying, attacking, and eliminating potential threats. Together, they form a complex defense system that works continuously to protect your body, often without you even realizing it.
Pathogens are always around us; we coexist with microorganisms every day. However, their presence does not automatically mean we’ll get sick. Your body has several protective barriers and defense mechanisms that help prevent infections from developing. When these defenses become weakened or compromised, your body may have a harder time fighting off infections and recovering from illness.
What causes the immune system to become compromised?
Many factors can negatively impact immune function, including chronic stress, poor nutrition, inadequate sleep, a sedentary lifestyle, certain medical conditions, and some medications. While not all these factors are within our control, many everyday habits can help support the body's natural defenses.
Continue reading to discover how your lifestyle affects your immune system and explore practical ways to support your immune health, protect your body, and work toward a healthier life!
Your Immune System Depends On Your Digestive System
During the earliest stages of your development in the womb, you started out with three very essential tubes that would eventually form into different systems in your body. One tube developed into your cardiovascular system, another into your nervous system, and the third? Yep, your digestive system!
Your digestive tract began as an embryonic gut tube, which developed into different structures and organs as you grew. Along the way, various buds and outgrowths emerged from left to right, eventually contributing to organs such as your lungs, gallbladder, pancreas, and liver. And, of course, the stomach develops as part of this process, too! The digestive tract ultimately extends from your mouth to your anus — literally, from one end to the other.
Now, here’s where things get interesting. According to UCLA Health, around 70% of the body's immune system is associated with the gut. But how does that work?
Your digestive system has extensive contact with the outside world through the food and drinks we put into our mouths. As a result, the stomach and intestines encounter countless microorganisms, including bacteria. This exposure helps the immune system learn to distinguish between harmless, familiar microbes and potentially harmful invaders. In other words, your gut plays an important role in helping your immune system recognize what belongs and what may pose a threat.
With that said, it just might be in your best interest to pay closer attention to your diet! Different foods provide nutrients that support the health and function of various organs and systems throughout the body. So, it’s important not only to be a healthy eater but an intentional one, too.
Below you’ll learn about different organs, the foods that help support them, and their roles in the immune system.
Get Your Body Moving!
Especially now, more than ever, it’s so easy to get caught up in a sedentary lifestyle that exercising can start to feel like an “inconvenience.” I mean, to some degree, I get it. We’re living in a society where people are tied down with both work and family matters, and there never seems to be enough room for extracurricular activities. However, your immune system doesn’t care about those excuses; it still needs you to get moving!
To better understand this, let’s look at nature. Water in a stagnant pond can accumulate pollutants and harmful microorganisms, whereas flowing river water is constantly moving. Got the visual? Great! Now, apply that same principle to your body. Although the human body is not a pond, prolonged inactivity can negatively affect your health, while regular physical activity supports healthy organ function and overall well-being.
Your immune system benefits from an active lifestyle because regular movement supports the function of several organs and internal systems. When exercise becomes a consistent part of your routine, your heart becomes more efficient at pumping blood, digestion improves, and a healthier metabolism is supported. Additionally, lymph, which carries white blood cells, proteins, fats, and cellular waste, circulates more efficiently. According to the National Library of Medicine, muscle contractions also release signaling proteins called myokines, which play a role in regulating inflammation and supporting metabolic health.
Bottom line: Stay active daily and aim to exercise most days of the week. The National Library of Medicine also explains that physical activity may help improve the movement of bacteria and other particles out of the lungs and airways, supporting respiratory health, potentially reducing your chances of getting a cold, flu, or other illness.
So, go for a hike, jog around the neighborhood, or attend Zumba classes. And if you can’t make it outside, get moving at home! You can use a walking pad while working from home or find YouTube videos that let you follow along with a trainer from your living room. There are so many ways to stay active!
How Your Lifestyle Impacts Your Immune System—And How You Can Start Making Changes
What you do on a daily basis, how consistently you do it, and the choices you make over time all contribute to your lifestyle. Ask yourself: Do I get at least 7–8 hours of sleep? How often do I smoke or drink alcohol? Am I constantly stressed? Do I have an outlet where I can unpack my feelings and de-stress? What do my daily or weekly habits look like?
All these questions are relevant and can provide some insight into your current health and well-being. According to the Centers for Disease Control and Prevention (CDC), inadequate sleep, smoking, and excessive alcohol consumption can negatively affect immune function, making it harder for your body to fight off infections and other illnesses.
Even a moderately active lifestyle can positively impact your health and energy levels. University of Florida Health explains that moderate physical activity can be as simple as bicycling with your children a few times a week, walking for 20–30 minutes a day, going to the gym every other day, or playing golf regularly.
Your lifestyle also includes what and how you eat. And, just as we’ve learned, your gut plays an important role in your immune health. So, focus on nourishing your body! To help you get started, UCLA Health suggests increasing your vegetable intake, avoiding sugar-sweetened drinks, limiting red meat, incorporating flavorful spices like cinnamon, oregano, and turmeric, eating whole grains, and including healthy fats such as those found in avocados and olive oil.
The more colorful your plate is, the greater the variety of nutrients you may be getting. UCLA Health also explains what the colors of your food can tell you about its nutritional value.
The hardest part is getting started, but I hope this article has been insightful enough to encourage you to take those meaningful steps towards changing your life, especially if you’re seeking a healthier one.
Medical disclaimer: This content is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
“The body you take care of will take care of you.”
