Holiday flights expose you to unique health challenges that can leave you feeling depleted before you even reach your destination. According to Dr. Mercola, a board-certified family medicine osteopathic physician (DO) and multi-best-selling author, airplane cabins create conditions that can stress your immune system and disrupt your body’s natural rhythms.
Simple, natural strategies can help protect your health and leave you feeling energized rather than run down.
Why Air Travel Challenges Your Immune System
Dr. Mercola explains that airplane cabins present multiple stressors at once. The recirculated air is extremely dry, with humidity levels often below 20%, compared to the 30-50% your body needs. This dries out the mucous membranes in your nose and throat, your first line of defense against viruses and bacteria.
Cabin air pressure is equivalent to being at 6,000 to 8,000 feet above sea level, which reduces oxygen levels and puts additional strain on your cardiovascular and immune systems. Add in close proximity to other travelers, limited movement, and disrupted schedules, and your body faces a perfect storm of immune challenges.
Hydration and Immune-Supporting Nutrition
Proper hydration helps maintain healthy mucous membranes and supports lymphatic flow, which transports immune cells throughout the body. Dr. Mercola recommends drinking filtered water consistently before, during, and after your flight. Begin hydrating the day before travel and aim for at least eight ounces of water for every hour of flight time.
Avoid alcohol and caffeine during flights, as both contribute to dehydration. Herbal teas such as ginger or chamomile provide hydration while supporting digestion and relaxation.
Airport and airplane food is often processed and high in sugar, which can suppress immune function for hours. Pack nutrient-dense snacks like:
- Raw nuts and seeds for zinc
- Fresh fruit such as oranges or berries for vitamin C
- Hard-boiled eggs for quality protein and healthy fats
- Herbal tea bags to avoid sugary beverages
Using a saline nasal spray before and during the flight helps keep nasal passages moist and clear. Wash your hands frequently with soap and water, and use a natural hand sanitizer with ethyl alcohol and essential oils like tea tree or lavender when soap is not available.
Movement and Circulation During Flight
Sitting for extended periods slows lymphatic circulation, which plays a key role in immune health. Dr. Mercola recommends standing and walking the aisle about once an hour when possible. While seated, support circulation by rotating your ankles, stretching your neck and shoulders, and practicing deep breathing to improve oxygen flow and calm the nervous system.
These small movements help prevent stiffness, reduce the risk of blood clots, and keep immune cells circulating effectively.
Protect Your Sleep and Manage Stress
Disrupted sleep weakens immunity and drains energy. When traveling across time zones, Dr. Mercola suggests adjusting your sleep schedule a few days in advance by shifting bedtime and wake time 15 to 30 minutes closer to your destination.
Bring simple sleep supports such as a sleep mask, earplugs or noise-canceling headphones, and a travel pillow for neck support. After arrival, getting morning sunlight can help reset your circadian rhythm.
Travel-related stress triggers cortisol release, which can suppress immune function. Deep breathing exercises can help counter this response. Try inhaling for four counts, holding for two, and exhaling for six. Adaptogenic herbs like ashwagandha may also help your body manage stress more effectively when used before travel.
Your Natural Flight Health Plan
Dr. Mercola’s approach centers on preparation and consistency. Hydrate well starting the day before travel and pack immune-supporting snacks. During the flight, focus on movement, hydration, and rest. After landing, support recovery with fresh air, light movement, and nourishing meals.
Holiday travel doesn’t have to come at the expense of your health. With these simple, natural strategies, you can support your immune system, maintain your energy, and arrive ready to enjoy the season’s celebrations.
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