The August Mitochondria Routine

Small, doable shifts to make the most of what's left of summer.

If you caught my last newsletter or read my substack, you know I've been talking about mitochondria nonstop lately — to the point of glazed-over stares from innocent strangers at lunch. Here's why I can't stop: mitochondria are foundational for your health. They're the part of you that turns light, movement, and rhythm into actual energy. Mood. Clarity. Vitality. All of it starts here.

And August is a strange little window. The light is still long and generous, but the pace of life starts creeping back — school schedules loom, routines get lazy, and before you know it summer has slipped away without you ever really using it.

So this month, I got curious about my own routine. I asked: what would it look like to consciously spend what's left of summer supporting my mitochondria instead of just surviving the heat? Here's what I landed on, and what I'm inviting you to try too.

1. Double Down on Daylight

Morning light and midday light aren't the same signal — and your mitochondria are listening for both. Morning light sets your rhythm for the day, telling your whole system when to wake up and when to wind down later that night. Midday light is different — stronger, richer light your mitochondria can actually use as fuel.

This month, I'm getting both. I'm dragging my laptop outside instead of working from behind a window. I took a full day off just to hike. I'm looking for every excuse to be in daylight, not just near it.

If a full day outside isn't realistic, even ten minutes of real morning light — no sunglasses, no glass in between — sends a signal your whole system can use.

2. Take the Heat, but Respect the Shade

August sun is generous, but it's also intense. I'm not avoiding the heat — I'm using it — but I'm pairing it with real shade breaks and real hydration, instead of pushing through discomfort for its own sake. Daylight exposure works best when it's sustainable, not depleting — and that means water, minerals, and shade are part of the plan, not an afterthought.

Think of it as working with the season rather than gritting your teeth through it.

3. Reclaim the End of the Day

This is the one I rewrote entirely this month. My evening walk used to be an afterthought — something squeezed in if there was time. It was something I did more for the dog than myself. Now it's intentional: a specific time, a specific stretch, no phone, my dog, and prayer. The point isn't the steps. It's giving my system a clear signal that the day is winding down — heart, body, and spirit all closing the day together. I time my walk near sunset but well before bedtime arrives. The evening walk outside in nature with naked eyes to the skies sends safety signals to my nervous system for that wind-down ritual.

4. Let Light Lead, Not Caffeine 

One small but mighty shift: get your morning light first thing — before screens, before anything else demands your attention. Your mitochondria respond to that first light signal in a way nothing else replicates; it's setting the rhythm the rest of your day runs on.

If you drink coffee, this simply means light before the cup, not instead of it. And if anxiety is part of your picture, this is also a gentle reminder that caffeine isn't a requirement for a good morning — light can do a lot of that work on its own.

Your Turn

You don't need to overhaul your whole life to give your mitochondria a better August. Pick one of these. Try it for a week. Notice what shifts.

And if you want more of this kind of thing in small, useful doses, I've started something new: Mito Minutes on Substack — quick mitochondria tips, one at a time. The first one, "Light, Food, Then Coffee," is live now.

Here's to using every bit of light this August has left.

— Dr. Kelli