Maintaining your immunity level while traveling requires a proactive approach to combat the unique physical stress, disrupted sleep schedules, and unfamiliar germs you encounter on the road.

Some of the most effective habits to keep your immune system strong while traveling involve optimizing rest, hydration, diet, stress management, and hygiene.

Prioritize Aggressive Hydration

Airplane cabins have notoriously dry air that can quickly dehydrate your body and dry out the mucous membranes in your nose and throat. These moist membranes act as your body’s frontline physical defense, trapping viruses and bacteria before they enter your system. Dehydration also impairs blood flow, which reduces the efficiency of your circulatory system in transporting essential infection-fighting white blood cells throughout the body.

• Action Plan: Bring an empty, reusable water bottle through airport security and fill it up before boarding. Aim to drink water consistently throughout your journey, and significantly limit alcohol and caffeine intake, as both cause further dehydration and disrupt gut health.

Protect Your Sleep Schedule

Changing time zones, catching early flights, and sleeping in unfamiliar hotel beds can disrupt your internal circadian rhythm and cause severe travel fatigue. When you are sleep-deprived, your body produces fewer cytokines—critical proteins that target infection and inflammation—while simultaneously weakening your white blood cell response.

• Action Plan: Prioritize 7 to 8 hours of quality sleep each night leading up to and during your trip. Use simple sleep aids like an eye mask and earplugs to block out disruptions on planes or in hotels, and try to get natural sunlight first thing in the morning at your destination to reset your internal biological clock.

Eat a Nutrient-Dense Diet

It is easy to rely on heavily processed fast food or sugary snacks while rushing through terminals, but a poor diet leaves your cells starving for the micronutrients they need to function. Certain nutrients are absolutely vital for maintaining a highly responsive immune system: Vitamin C (found in citrus fruits and berries) supports white blood cell function; Zinc (found in nuts and seeds) modulates immune cells; and Antioxidants protect your healthy cells from damage.

• Action Plan: Fill your travel bag with immune-supporting snacks like almonds, pumpkin seeds, or whole-food protein bars. When dining out, deliberately look for colorful meals that feature leafy greens, fresh fruits, and lean proteins rather than relying solely on heavy comfort foods.

Actively Manage Travel Stress

Whether it is navigating a confusing airport, dealing with a flight delay, or rushing to stick to a tight itinerary, travel inherently introduces mental and physical anxiety. When your body experiences chronic or elevated stress, it releases a surge of the hormone cortisol. While short bursts of cortisol are fine, sustained high levels directly suppress and push down your immune system’s ability to effectively fight off viruses and pathogens.

• Action Plan: Pace your itinerary so you are not constantly rushing, and incorporate brief, 5-minute deep breathing exercises or gentle stretches into your travel days. Remember to move your body through light physical activity—like a brisk walk around the terminal or destination—which naturally lowers cortisol and mobilizes your immune cells.

Practice High-Yield Hygiene

Your immune system cannot get overwhelmed by germs if you prevent those germs from entering your body in the first place. Public transit, gas stations, airplanes, and checkout counters are filled with high-touch communal surfaces where contagious viruses and bacteria thrive. If you touch a contaminated surface and immediately touch your eyes, nose, or mouth, you introduce pathogens directly into your system.

• Action Plan: Wash your hands thoroughly with soap and warm water for at least 20 seconds before eating and after using public restrooms. Pack a travel-sized hand sanitizer (containing at least 60% alcohol) and disinfectant wipes to quickly clean your hands, tray tables, and phone screen when soap is unavailable.