If the video above landed for you, you probably recognized yourself in at least one of those three signals.
Maybe it was the heavy morning, the 2 p.m. cliff, or the hard week that follows you into the next one.
In the video, I gave you a starting week: a morning check-in, a look at your afternoon cliff, and one recovery deposit.
This article picks up where that week ends.
It’s about how to improve mitochondrial function over the following months, once the novelty wears off and real life pushes back.
Ultimately, it’s about turning one good week into a practice you can keep.
You’ll learn how to read what your tracking is telling you, how to tell whether a stressor built you up or wore you down, and how to fix the specific problems your signals point to.
I’ll also share research the video didn’t get into, including what the science says about naps, caffeine timing, antioxidant pills, and exercise for people who are already running on empty.
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In This Article
- Key Takeaways
- How to improve mitochondrial function starts with your own data
- What to do with the stress you can’t remove
- Dose your stress like medicine
- Exercise that builds mitochondria without wiping you out
- Fixing the afternoon energy crash at the source
- Making recovery as deliberate as your workload
- What to expect over the next 12 weeks
- Frequently Asked Questions
- Sources
Key Takeaways
- Short bursts of stress hormones appear to support mitochondrial function, while chronically high levels wear it down, so the goal is to shape your stress rather than erase it.⁴˒⁵
- A two-week scorecard that rates your mornings, afternoons, and recovery against your daily habits shows you which lever to pull first.
- Higher positive mood at night has been linked to healthier mitochondria in chronically stressed caregivers, which makes your evening wind-down part of the plan.³
- High-dose antioxidant supplements taken during training may blunt the very adaptations exercise is supposed to trigger.⁶
- Interval training has improved mitochondrial respiration in both younger and older adults, but people who feel tired but wired should build up to it gradually.⁵˒⁷
- A 10-minute nap tends to refresh you faster than a longer one, and caffeine six hours before bed can still cost you more than an hour of sleep.¹⁰˒¹¹
- Meaningful change takes weeks to months, so judge your progress by trends in your scorecard rather than by any single day.⁷˒¹³
How to improve mitochondrial function starts with your own data
The one-word morning check-in from the video is a great start.
However, one word a day won’t tell you why a morning went badly. For that, you need a little more data.
So once your first week is done, upgrade it into a simple scorecard you keep for 14 days. It takes about two minutes each evening.
More importantly, it turns a vague “I’m always tired” into a pattern you can act on.
Score the three signals
Each evening, give yourself three quick ratings:
- Morning: 1 to 5, where 1 means you dragged yourself up and 5 means you felt ready before coffee.
- Afternoon: the time your energy dropped, plus how deep the drop felt on the same 1-to-5 scale.
- Recovery: after the hardest thing you did today, how many hours passed before you felt like yourself again?
Log the inputs next to the scores
The scores only become useful when you can see what sat beside them.
So next to each day, jot down a handful of inputs:
- Bedtime and wake time
- The time of your last caffeine
- What you ate for lunch
- Any workout and how hard it felt
- The biggest stressor of the day
- How you spent the last hour before bed
Read the pattern at day 14
After two weeks, look for the inputs that keep showing up next to your worst scores.
Most people find one or two repeat offenders.
For example, your low mornings might cluster after late screens or a late coffee.
Your cliff might hit harder on days when lunch was mostly bread.
Meanwhile, your slow recovery might trace back to one relationship or one kind of meeting.
That’s your starting point.
Instead of overhauling everything at once, you pull the lever your own data points to.
Of course, if your scores stay low no matter what you change, that tells you something too. I’ll come back to that near the end.
Scorecard decoder
What Your Day-14 Pattern Is Pointing To
Find the row that matches your scorecard. Then start with that lever and leave the rest alone for now.
If you see
Low mornings, decent afternoons
Likely lever: Your sleep window and the last hour of your day
Start with: The caffeine cutoff and an evening close
If you see
Fine mornings, deep afternoon cliff
Likely lever: How your body switches fuel after lunch
Start with: The lunch swaps and a short walk after eating
If you see
Slow recovery after workouts
Likely lever: A training dose that’s too big for right now
Start with: Drop one rung on the exercise ladder
If you see
Slow recovery after people or events
Likely lever: A threat signal you’re carrying
Start with: An evening close and paired recovery deposits
If you see
All three low, whatever you change
Likely lever: Something a scorecard can’t see
Start with: Targeted lab testing
What to do with the stress you can’t remove
The research linking stress to mitochondria is strong enough that I bring it into every conversation about energy.
A systematic review by Martin Picard and Bruce McEwen found that most controlled studies showed psychological stress harming mitochondrial structure or function.¹
To be fair, most of that work was done in animals, and human data is still catching up.¹
Even so, the direction is consistent.
The same team describes the long-term result as mitochondrial allostatic load.
In plain terms, that’s the wear and tear that builds when stress chemistry never fully switches off.²
It’s the cellular side of chronic stress and fatigue, and one reason so many people feel tired and anxious at the same time.¹˒²
In the video, I asked you to sort your threat signals into what you can resolve and what you have to build tolerance to. Resolving is simple, even when it’s hard.
Building tolerance is where most people get stuck, because nobody shows them what it looks like day to day.
That’s also where much of the answer to how to improve mitochondrial function hides for caregivers, parents, and anyone carrying a load they didn’t choose.
Why the end of your day matters
One study makes this concrete.
Researchers compared mothers caring for a child with autism to mothers of neurotypical children.³
The caregivers showed lower mitochondrial health in their immune cells.³
Here’s the part I find hopeful:
Higher positive mood at night was linked to healthier mitochondria.
Better still, that nightly mood partly explained the gap between the two groups.³
This study shows an association, not proof of cause.
Still, it suggests that how you close your day may matter as much as how hard the day was.
Build an evening close
So if you’re carrying something heavy, protect the last 30 minutes of your day.
Give them a deliberate close:
- Park the worry. Write tomorrow’s top three concerns on paper, so your mind doesn’t have to hold them overnight.
- Name one thing that went right. Keep it small and specific.
- End on something that restores you. Read, stretch, or have a quiet conversation instead of scrolling.
None of this removes the load. Still, it changes the note your day ends on, and that note appears to matter.³
Over time, this kind of steadiness under pressure becomes a trained skill.
It’s a big part of the nervous system work I teach inside Lights On.
For heavy seasons
Five Small Resets for Days You Can’t Change
You can’t remove the load. You can stop it from running all day without a single break.
Before your phone
Take two quiet minutes before any messages. Pick one thing you’ll protect today.
After a hard moment
For one minute, breathe out longer than you breathe in before you start the next task.
Midday
Spend five minutes outside without your phone. Let your eyes rest on something far away.
At the door
Pause before you walk in. Name the role you’re setting down for the evening.
Last 30 minutes
Your evening close: park the worry, name one win, end on something that restores you.
Small, repeatable, and daily. That’s how tolerance actually gets built.
Dose your stress like medicine
This is where many tired but wired people go wrong.
They hear that cold plunges, fasting, and hard workouts build mitochondria.
Then they stack all three on top of a life that’s already maxed out.
The research on hormesis explains why that backfires.
The inverted U
In a well-known study on brain cells, low doses of stress hormones supported mitochondrial function.
In contrast, chronically high doses weakened it.⁴
The researchers described the relationship as an inverted U.⁴
Elissa Epel at UCSF draws the same line at the level of the whole person.
Toxic stress is ongoing and unrelenting.⁵
Hormetic stress, on the other hand, is brief, intermittent, and moderate, and it’s followed by quick recovery.⁵
That recovery isn’t a bonus. It’s the whole point.
How to tell if a dose was right
In the video, I described the sweet spot for this kind of stress.
The practical question is how you know you hit it.
Your scorecard answers that.
- Check the next morning. If your morning score dropped by two points or more, the dose was too big.
- Check that night’s sleep. If you felt buzzy and couldn’t settle, your body read it as threat, not training.
- Check your recovery time. If it stretched past a day, back off next time.
On the other hand, if you slept well and woke at or above your usual score, you found a dose your body can use.
Reading these signals is a skill, and it sharpens with practice.
In fact, learning to sense what’s happening inside your body is where Lights On begins.
Don’t stack while you’re depleted
When your scores are low, limit yourself to one deliberate stressor per day.
A cold shower, a fasted workout, and a hard breath session on the same day aren’t three deposits.
For a depleted system, they add up to one big withdrawal.
Add a second stressor only after your recovery scores have held steady for a full week.
A note on antioxidant pills
Many people try to protect themselves with high-dose antioxidants.
However, the stress signal from exercise appears to be part of what drives the adaptation.
In one trial, young men took 1,000 mg of vitamin C and 400 IU of vitamin E daily during four weeks of training.⁶
Compared with no vitamins, the supplements blocked the exercise-driven gains in insulin sensitivity.
They also blocked the rise in the body’s own antioxidant defenses.⁶
That was one study, in healthy young men, at high doses.
Still, it’s worth thinking twice before taking megadoses around your workouts.
Eat your colorful plants instead.
Dose guide
Start Low, Build Slowly
Common stressors, scaled to where your scorecard is right now. Change one dial at a time.
Cold
Scores low: start here
End a warm shower with 15 to 30 seconds of cool water.
Scores steady: build toward
Work up to one to three minutes of cold at the end of a shower.
Heat
Scores low: start here
A warm bath in the evening.
Scores steady: build toward
Short sauna sessions, with water and a full cool-down after.
Fasting
Scores low: start here
A 12-hour overnight gap between dinner and breakfast.
Scores steady: build toward
A longer overnight window on a few days a week, if it suits you.
Breathwork
Scores low: start here
Slow breathing with long, easy exhales.
Scores steady: build toward
More vigorous breath practices, always seated and never in water or while driving.
Check with your practitioner first if you’re pregnant, have diabetes or a heart or blood pressure condition, or take medication that affects blood sugar or blood pressure.
Exercise that builds mitochondria without wiping you out
Exercise remains one of the most reliable answers to how to improve mitochondrial function.
In a 12-week trial, high-intensity interval training improved mitochondrial respiration in younger adults and in adults aged 65 to 80.⁷
Interestingly, strength training alone built muscle but didn’t improve mitochondrial respiration. Combined training, however, did.⁷
That’s encouraging, especially if you’re worried it’s too late.
But if you’re always tired after exercise right now, intervals probably aren’t your first step.
Climb the ladder one rung at a time
- Weeks 1 and 2: Take easy walks of 20 to 30 minutes, at a pace where you can talk comfortably.
- Weeks 3 and 4: Add a few gentle pickups inside the walk. Go 30 seconds faster, then ease back.
- Week 5 and beyond: If your recovery scores hold, try a short interval session once or twice a week. Add strength work on other days.
Let your scorecard set the pace.
If slow recovery after exercise shows up two days in a row, drop back a rung for a week.
Pushing through that signal is exactly how the wired and tired pattern digs in deeper.
I go further into pacing and gentle rebuilding in my guide to chronic fatigue natural recovery.
Intensity gauge
The Talk Test
No heart-rate monitor? Your voice tells you how hard you’re working.
Easy
Talk test: You can speak in full sentences.
Use it for: Your base. Most of your rebuilding happens here.
Moderate
Talk test: You can speak in short phrases.
Use it for: The gentle pickups, once your recovery holds.
Hard
Talk test: You can only get out a word or two.
Use it for: Short intervals only, and only when your scorecard says yes.
Stop and get checked if you feel chest pain or pressure, dizziness, unusual breathlessness, or a racing or irregular heartbeat.
Fixing the afternoon energy crash at the source
Some afternoon dip is built into your biology.
Sleep researchers have shown that the post-lunch dip happens even when people skip lunch and don’t know the time.⁸
A heavy, high-carbohydrate lunch makes it worse, though.⁸
So the goal isn’t to erase the dip. It’s to keep a shallow dip from turning into a full afternoon energy crash.
Build a lunch that won’t drop you
A steep crash often points to weak metabolic flexibility.
That’s your body’s ability to switch smoothly between burning glucose and burning fat.⁹
Inflexibility is a hallmark of insulin resistance and type 2 diabetes, and exercise is one of the main ways to improve it.⁹
At lunch, build the plate around protein, vegetables, and healthy fat.
Treat starch as a side rather than the base. Then, if you can, take a 10-minute walk after you eat.
Your gut matters here as well.
If meals leave you bloated or foggy, read my articles on gut health and energy levels and on breaking the digestive issues and chronic fatigue cycle.
Nap shorter, not longer
In the video, I suggested a 20-minute nap as a recovery deposit.
The research adds a useful refinement.
In one lab study, a 10-minute nap gave immediate gains in alertness and mood that lasted up to about two and a half hours.¹⁰
A 20-minute nap helped too, but its benefits took about 35 minutes to arrive.¹⁰
A 30-minute nap caused grogginess first.¹⁰
So if you need to function right afterward, aim for about 10 minutes.
If you can afford a slower wake-up, 20 minutes works.
Either way, set an alarm.
Move your last coffee earlier
In the video, I asked you to skip the afternoon coffee for a day so you could feel the signal clearly.
There’s also a longer-term reason to move it earlier.
In one sleep study, 400 mg of caffeine taken six hours before bed cut total sleep by more than an hour.¹¹
That lost sleep then shows up as a worse morning score.
As a result, the afternoon coffee quietly feeds the very cycle it promises to fix.
Try a caffeine cutoff at least six hours before bed for two weeks. Then check what happens to your scorecard.
Lunch swaps
Keep the Dip From Becoming a Cliff
Small changes to meals you already eat. No new recipes required.
Instead of
A sandwich on white bread with chips
↓
Try
The same fillings over a big salad, with one slice of whole-grain bread
Instead of
A big bowl of pasta
↓
Try
Half the pasta, plus chicken or fish and a pile of vegetables
Instead of
A rice-heavy burrito bowl
↓
Try
Light on rice, heavy on beans, meat, greens, and guacamole
Instead of
A granola bar at your desk
↓
Try
Leftovers, eggs, or a protein-rich soup you actually sit down for
Instead of
A sweetened iced drink
↓
Try
Sparkling water or unsweetened iced tea
Same food, better order: start with the vegetables and protein, and finish with the starch.
Making recovery as deliberate as your workload
Most of the people I work with don’t lack effort. They lack recovery.
Their calendars schedule every challenge and leave rest to chance.
This is the quiet side of how to improve mitochondrial function, and it’s the side most people skip.
Pair every withdrawal with a deposit
Before your week starts, look ahead and circle the hardest days: the big deadline, the tough family visit, the long travel day.
Then book a recovery deposit for that evening or the next morning.
Treat it like an appointment, not a reward you earn if there’s time left over. There’s rarely time left over.
Practices with evidence behind them
Deliberate relaxation counts.
In one study, a single session of relaxation-response practice changed gene activity in blood cells.¹²
Genes tied to energy metabolism and mitochondrial function turned up, while inflammation-related genes turned down.¹²
Notably, the effects were stronger in long-term practitioners than in beginners.¹²
That’s gene expression, not a direct measure of mitochondrial structure.
Even so, it fits what I’ve seen for decades: consistency beats intensity.
Protect your sleep window
Sleep is still the biggest deposit you can make.
If you’re wiped out all day yet wide awake at 3 a.m., that pattern deserves its own attention.
My guide on cortisol and sleep problems walks through it in detail.
Give your practice a structure
The hardest part of all this isn’t knowing what to do.
It’s still doing it in week nine, when nothing feels urgent anymore.
That’s exactly why I built Lights On.
It’s a 52-week path of guided practices, released one week at a time, with modules on sleep and recovery, energy cultivation, and nervous system mastery.
Each week comes with audio practices and worksheets, and you can bring your real questions to my live weekly calls.
It’s included in The Urban Monk Academy, along with daily Temple Grounds practices you can do whether you have five minutes or an hour.
For simpler options you can start today, see my list of chronic fatigue natural remedies.
Recovery matching
Match the Deposit to the Drain
Different kinds of tired need different kinds of rest.
Rest that doesn’t match the drain often leaves you just as tired as before.
What to expect over the next 12 weeks
Mitochondria don’t rebuild on a weekend schedule.
They’re constantly fusing, dividing, and being recycled, and that quality-control process shapes how well they work.¹³
When it falters with age and chronic stress, damaged mitochondria tend to pile up.²˒¹³
The good news is that this process responds to input.
In the 12-week training trial, measurable mitochondrial gains showed up by the end of the program.⁷
When people ask me how to improve mitochondrial function quickly, this is the honest answer.
Here’s roughly what I tell them to expect:
- Weeks 1 and 2: Your best days get a little better first. Bad days still happen.
- Weeks 3 to 6: Mornings start to steady. The afternoon cliff gets shallower or arrives later.
- Weeks 7 to 12: Recovery speeds up. A hard day costs you one evening instead of three.
That’s a typical arc, not a promise.
Some people move faster, while others need longer.
This is also why I built Lights On as a full year rather than a 30-day program.
When it comes to how to improve mitochondrial function for good, months of steady practice beat any sprint.
When to look deeper
If your scores don’t budge after six to eight weeks of honest effort, something else may be draining you.
At that point, it’s time to get tested rather than try harder.
Start with the blood tests for chronic fatigue that standard panels often leave out.
Then look at the chronic fatigue causes that rarely get checked.
Maybe you’ve already gone down the road of adrenal fatigue recovery protocols.
If so, I’d look at what’s happening underneath: the stress chemistry and the cellular energy system I cover here and in my piece on mitochondrial health energy.
Finally, new or severe symptoms come first.
Unexplained weight loss, chest pain, fainting, or shortness of breath need a doctor before any of this.
Beyond week 12
How to Keep the Gains
Progress holds when the habits stay, even in a lighter form.
Expect dips in stressful seasons. The habits are what bring you back faster.
Frequently Asked Questions
Here are the questions I hear most often once people start working on their energy.
How long does it take to improve mitochondrial function?
Usually weeks to months, not days.
In one exercise trial, clear mitochondrial gains showed up after 12 weeks of consistent training.⁷
In my experience, many people feel steadier within a month when they address stress and recovery at the same time.
What are the most common mitochondrial dysfunction symptoms?
In my experience, the most common signs are fatigue that sleep doesn’t fix, a steep afternoon crash, and slow recovery after effort.
These overlap with many other conditions, though.
They’re not a diagnosis on their own, so if they persist, work with a practitioner and get proper labs.
Is there a real link between cortisol and fatigue?
Yes.
Short bursts of stress hormones appear to support mitochondrial function, but chronically high levels seem to weaken it.⁴
Over time, that pattern feeds what researchers call mitochondrial allostatic load.²
Why am I always tired even when I sleep enough?
Sleep is only one input.
Chronic psychological stress can affect your mitochondria directly, even when your hours in bed look fine.¹˒³
Your scorecard will help you see which signal is driving it for you.
If nothing improves after a couple of months, get tested.
Should I take antioxidant supplements to protect my mitochondria?
Not necessarily.
High doses of vitamins C and E blocked some of the benefits of exercise in one trial.⁶
Whole foods are a safer bet, and it’s wise to review any supplements with your practitioner.
Can meditation really help your mitochondria?
The early evidence is promising but limited.
Relaxation-response practice has shifted the activity of genes linked to mitochondrial function, especially in long-term practitioners.¹²
More research is needed. Still, it’s low-risk, and it lowers the chronic threat load that research ties to mitochondrial wear and tear.²˒⁵
Ready to make it stick?
Turn This Into a Practice You Keep for Life
Lights On walks you through a full year of guided practice, one week at a time. Inside The Urban Monk Academy, you’ll also get daily Temple Grounds practices and live weekly calls with me.
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Sources
- Psychological Stress and Mitochondria: A Systematic Review, Psychosomatic Medicine, 2018
- Psychological Stress and Mitochondria: A Conceptual Framework, Psychosomatic Medicine, 2018
- A Mitochondrial Health Index Sensitive to Mood and Caregiving Stress, Biological Psychiatry, 2018
- Dynamic Regulation of Mitochondrial Function by Glucocorticoids, Proceedings of the National Academy of Sciences, 2009
- The Geroscience Agenda: Toxic Stress, Hormetic Stress, and the Rate of Aging, Ageing Research Reviews, 2020
- Antioxidants Prevent Health-Promoting Effects of Physical Exercise in Humans, Proceedings of the National Academy of Sciences, 2009
- Enhanced Protein Translation Underlies Improved Metabolic and Physical Adaptations to Different Exercise Training Modes in Young and Old Humans, Cell Metabolism, 2017
- The Post-Lunch Dip in Performance, Clinics in Sports Medicine, 2005
- Metabolic Flexibility in Health and Disease, Cell Metabolism, 2017
- A Brief Afternoon Nap Following Nocturnal Sleep Restriction: Which Nap Duration Is Most Recuperative?, Sleep, 2006
- Caffeine Effects on Sleep Taken 0, 3, or 6 Hours Before Going to Bed, Journal of Clinical Sleep Medicine, 2013
- Relaxation Response Induces Temporal Transcriptome Changes in Energy Metabolism, Insulin Secretion and Inflammatory Pathways, PLoS ONE, 2013
- Mitochondrial Dynamics: Coupling Mitochondrial Fitness with Healthy Aging, Trends in Molecular Medicine, 2017