As a Calgary-based physician with over four decades of experience, Dr. Peter Nieman has developed a unique perspective on seasonal health, which he calls the "Tree Theory." Observing patterns over 42 consecutive winters in the city, he notes a direct correlation between the health of local children and the lifecycle of the trees outside their windows.
The "Tree Theory" of Seasonal Health
Dr. Nieman's theory is simple yet profound. He has observed that as soon as the trees turn yellow and lose their leaves, children's health begins to deteriorate. This period, which lasts approximately eight months in Calgary, sees a greater prevalence of viral infections leading to more frequent asthma attacks, increased school absences, sleep-deprived parents, and emergency rooms pushed to their limits.
"Once trees have their leaves re-established," Nieman explains, "the long, dark tunnel of infections subsides." He attributes this shift to several factors: easier access to fresh air and outdoor play, fewer germs accumulating in enclosed spaces, and a natural tendency to consume more fresh, healthy foods. Additionally, exposure to sunlight provides natural Vitamin D, helping to combat seasonal depression and optimize immune function—a connection supported by the science of psycho-immunology.
The Foundational Role of Lifestyle Habits
Beyond environmental observations, Dr. Nieman emphasizes that consistent, basic lifestyle habits are the cornerstone of resilience. The families who fare best through the winter are those who pay close attention to nutrition, maintain their exercise routines regardless of the season, prioritize a good night's sleep, and actively manage stress.
While acknowledging the importance of academic discussions on vaccines for prevalent winter viruses, Nieman points out that no vaccine exists for the common cold caused by the Rhinovirus. Therefore, he argues, lifestyle habits are as crucial as vaccines and antiviral medications.
Key Vitamins and Supplements for Immune Support
To combat the nutritional shortfalls of winter, when fresh produce is less accessible, Dr. Nieman highlights specific nutrients that play key roles in supporting the immune system.
Vitamin A is vital for white blood cells and the mucous membranes in the intestines and lungs. Excellent sources include:
- Sweet potatoes, carrots, spinach, and broccoli
- Fatty fish like salmon and mackerel
- Milk and eggs
Vitamin B6 supports both white blood cells and T-cells, which are critical for fighting infections. Good sources are:
- Tofu, tuna, salmon, and beef
- Chickpeas
Dr. Nieman's decades of experience in Calgary serve as a reminder that while nature's cycles impact our health, proactive attention to foundational wellness practices can help build a stronger immune defense, making the winter months more manageable for the entire family.
