From common colds to the cyclosporiasis outbreak, there are plenty of reasons to prioritize your immune system this year. According to The Cleveland Clinic, “your immune system is your body’s first-line defense against invaders like germs. It helps protect you from getting sick and promotes healing when you’re unwell or injured.” And while no habit can guarantee you won’t get sick, experts say your daily routine can make a significant difference in how well your immune system functions. From getting enough sunlight to prioritizing quality sleep, a few consistent lifestyle changes can help your body defend itself against illness.
We spoke to Gary Brecka, human biologist, longevity expert, and host of The Ultimate Human podcast, to learn about some habits that support your body’s natural defenses every day. Find all of his expert advice below.
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1. Get Morning Sunlight And Check Your Vitamin D Levels
One of the simplest ways to support immune health is by fitting some sun into your morning routine shortly after waking. Brecka recommends spending 10 to 15 minutes in morning sunlight each day while also making sure you know your vitamin D status through testing.
"Get 10–15 minutes of morning sunlight and know your vitamin D number. Vitamin D3 is the backbone of immune defense, and most people have never tested it—supplementing blind or not at all leaves the most common deficiency in play," he says.
Vitamin D plays an important role in regulating immune function, and research has linked low vitamin D levels to an increased susceptibility to infections. Morning sunlight also helps regulate your circadian rhythm, making it easier to sleep well at night—another key factor in maintaining a healthy immune system.
2. Prioritize A Consistent Sleep Schedule
When life gets busy, you may start skimping on sleep—but this is a major mistake if you want to stay healthy year-round, as rest is crucial to your immune system. Brecka explains that the immune system performs some of its most important restorative work while you're asleep.
"Protect a consistent sleep window. The deepest immune repair happens in slow-wave sleep, and consistency of bed/wake times matters more than the occasional long lie-in," he says.
While sleeping in on weekends may feel like rest, regularly shifting your bedtime and wake-up time can disrupt your body's internal clock. Maintaining a predictable sleep schedule can help maximize the time your body spends in restorative slow-wave sleep, supporting immune function along with overall health.
Aim to go to bed and wake up at roughly the same time every day—even on weekends—to give your body the consistency it needs.
3. Move Your Body And Breathe With Intention
Exercise benefits more than just your muscles and heart. It also helps keep an important part of your immune system functioning efficiently.
"Move every day and breathe deliberately. The lymphatic system—your immune plumbing—has no pump. Walking, resistance training, and periodic deep breathing keep lymph moving, helping immune cells circulate and waste products clear more efficiently," Brecka explains.
Unlike your circulatory system, which relies on the heart to pump blood throughout the body, the lymphatic system depends largely on movement and muscle contractions to transport lymph fluid. Daily walks, strength training sessions, stretching, or other forms of regular movement can all help support this process.
Deep breathing may also encourage lymphatic circulation while helping lower stress, which itself can influence immune health over time.
The Bottom Line
Supporting your immune system doesn't have to require complicated wellness routines. According to Brecka, consistently getting morning sunlight, protecting your sleep schedule, and moving your body every day can help lay the foundation for better immune function. While these habits won't eliminate every illness, building them into your daily routine may help your body stay more resilient all year long.
