By: Brigid Bandomer BSN, HWNC-BC
As the weather cools and the days shorten, our biology receives a powerful invitation: slow down, sync up, and recharge.
While most people brace for colds, fatigue, and holiday overwhelm, fall is actually a natural window for restoration ā if you know how to align with it.
In this post, weāll explore five ways to use the changing season to optimize your health, with a special focus on circadian rhythms and mitochondrial support.
āļø 1. Get Light the Right Way: Vitamin D and Circadian Rhythm in Fall
Fall sunlight still has power ā but only for a short while. As we move toward winter, the sunās angle drops, reducing your ability to make vitamin D through the skin
Use tools like MyCircadianClock or D-Minder to track your local sun exposure window.
š Example: Midday sun this week produced ~5,400 IU of vitamin D in 1 hour of unprotected skin exposure.
Why morning and midday light matters:
- Early morning light promotes photobiomodulation (PBM) improving metabolism, mood and decreasing inflammation (Huberman)
- Stimulates vitamin D synthesis (NIH study)
- Signals melatonin production for later sleep (NLM review)
Tips to optimize light:
- Get outside in the morning ā even if itās cloudy or dim
- Avoid sunglasses early in the day
- Sit near windows or take walking breaks if you work indoors
- Prioritize outdoor time through November, before UVB drops off
š” 2. Rethink Artificial Light to Protect Your Sleep and Mood
After sunset, our bodies expect darkness. But modern lighting keeps us in a perpetual summer ā confusing our internal clocks.
Even low-level blue light at night can suppress melatonin and disrupt sleep (Harvard Health).
Use lighting intentionally:
- Morning (before sunrise): Use orange/yellow glasses
- Daytime: Seek out natural light, especially under fluorescents
- Evening: Dim lights, use red bulbs, or light a candle
- After dark: Avoid screens or wear red-tinted glasses
š¬ Blue-blocking glasses improve sleep and mood ā backed by peer-reviewed research.
š„ 3. Eat Seasonally for Immune and Mitochondrial Support
Your food choices affect your circadian rhythm and mitochondrial function.
Fall is the original harvest season ā loaded with antioxidant-rich produce and warming, nourishing meals.
Best fall foods for mitochondria:
- Fatty fish (for vitamin D and omega-3s)
- Mushrooms (can create vitamin D when exposed to sunlight)
- Root vegetables (carrots, beets, parsnips)
- Bone broth, leafy greens, apples, squash
š Seasonal eating supports immune resilience (Frontiers in Nutrition).
ā Find local food: Weston A. Price Farm Directory
š 4. Embrace Scarcity: Fasting and Meal Timing in the Fall
In nature, fall leads to winter ā a time of scarcity. You can mimic this gently through time-restricted eating or intermittent fasting.
Why fasting helps:
- Enhances mitochondrial function via mitophagy (Cell Metabolism)
- Strengthens circadian rhythm and metabolic health (Salk Institute)
How to begin:
- Start with 3 meals/day, no snacking
- Stop eating 3 hours before bed
- If you’re already doing that, try a longer fast 1x/week (with guidance)
š§ Fasting is a form of āseasonal alignmentā that helps signal rest, repair, and mitochondrial renewal.
āļø 5. Let Yourself Feel the Cold: Activate Brown Fat and Resilience
Weāre not meant to live in permanent comfort. Strategic cold exposure is one of the most effective ā and natural ā ways to stimulate your mitochondria.
Benefits of cold exposure:
- Activates brown adipose tissue (BAT) for metabolic boost (Nature Reviews)
- Increases norepinephrine and mood-enhancing endorphins (NIH study)
- Strengthens immune function and reduces inflammation (Journal of Applied Physiology)
Easy cold practices:
- Step outside in the morning without bundling up
- End your shower with 30 seconds of cold
- Try a cold face plunge or brisk walk in the cool air
š„ Your mitochondria are not built for endless climate control. Let nature remind them how to burn bright.
š Conclusion: Fall Is Natureās Invitation to Heal
We associate fall with cold and flu season. But maybe the real problem isnāt the season ā maybe itās how we fight against it.
- We stay indoors under artificial light
- We eat sugar from Halloween to New Yearās
- We skip nature and chase productivity
- We avoid cold and overeat comfort food
This season was made for rest, rhythm, and renewal. Let nature show you how.










