Kids Mitochondria Health: Unlocking Energy & Toxins
- Nov 1, 2025
- 6 min read
Updated: 6 days ago
Your kid is tired. Not sleepy-tired. Flat. They come home from school and lie on the floor. They used to ride bikes until dark and now getting them off the couch takes three asks and a fight. They slept nine hours and still can't get up. And every time you bring it up, someone tells you it's growth, or screens, or a phase.
You've done everything right. You moved bedtime earlier. You cut the screens. You had the blood work done and it came back normal. And something is still being missed. When a parent describes a child who sleeps and still isn't rested, one of the first things I think about is where that child's energy is actually made.
What do parents ask me most about this?
Short answers first. The full reasoning is below.
What are mitochondria, in plain words?
Small structures inside almost every cell whose job is to turn food and oxygen into usable energy. Brain cells, heart muscle and working muscle are packed with them, because those jobs cost the most.
What does running low look like at home?
A child who sleeps a full night and wakes unrefreshed, aching legs after ordinary play, trouble that clusters in the afternoon when the tank runs down, and getting sick easily. No single one proves anything. Together they make a pattern.
My child's bloodwork was normal. Does that rule this out?
Not on its own. Parents describe this pattern more accurately than any single test does, which is why what you notice at home matters here.
What wears these engines down?
Not enough raw material from food, not enough oxygen at night, and ongoing inflammation. An inflamed gut or a chronic sinus problem costs energy the body has to pay for out of the same account.
Where does testing fit?
Last. The Foundational Five come first, because no test changes the fact that a child who is not breathing well at night will be depleted.
The tiny engines inside every cell
Inside almost every cell in your child's body sit small structures called mitochondria. Say it my-toe-KON-dree-uh. Their job is to take the food your child eats and the oxygen your child breathes and turn it into usable energy.
Some parts of the body carry far more of them, because some jobs cost more. Brain cells, heart muscle, and working muscle are packed with them. That is why when energy production dips, the first complaints tend to be about thinking, mood, and stamina. The most expensive tissue feels it first.
Energy also pays for things you never think about. Digesting food. Making stomach acid. Moving poop through the intestine. Fighting off a virus. Settling back down after being startled. When the supply is tight, those get rationed too. That is part of why a tired child is so often also a constipated child with a short fuse.
What running low looks like at home
Parents describe this more accurately than any test does. Watch for a child who sleeps a full night and wakes unrefreshed, or who crashes after activity and is still wrecked the next day.
Watch for aching legs after ordinary play. Trouble that clusters in the afternoon, when the tank runs down. Getting sick easily and taking longer than other kids to bounce back. Slow, hard poop. Heat or cold bothering them more than it should.
No single one of those proves anything. Together they make a pattern worth paying attention to.
Where mitochondria show up in real medicine
Doctors have known about mitochondria going wrong for decades. There is a group of rare inherited conditions called mitochondrial disorders where the machinery is clearly broken. Those are diagnosed by geneticists and metabolic specialists. That is not what I am describing here, and a child who has one needs that team.
What is newer is the research on mitochondria running underpowered without a named disease. A 2024 review that pooled many studies found markers of mitochondrial trouble more frequently in children with autism than in comparison groups. That does not tell us cause and effect, and it does not mean every child with autism has this. It does mean the question is a legitimate one to ask about a specific child, rather than a fringe idea.
What wears these engines down
Not enough raw material
Mitochondria need building blocks that come from food. B vitamins, magnesium, iron, and protein all show up somewhere in the process. A child living on beige carbs with a very short food list is trying to run a factory with no deliveries. That is why I look hard at what a child actually eats before I look at anything else.
Not enough oxygen at night
This one gets missed constantly. If your child snores, breathes through their mouth, gasps, or sweats through their pajamas, they may not be moving enough air. Oxygen is half the equation. You cannot make energy well without it. That is why airway is one of the Foundational Five, and why I ask about snoring at every visit.
Ongoing inflammation
An inflamed gut, a chronic sinus problem, or a low-grade immune fight all cost energy. The body pays for that fight out of the same account it pays for everything else.
What is in the environment
There is real science here and also a lot of internet noise, so let me be measured. Researchers have measured changes in mitochondrial DNA in newborns whose mothers had higher exposure to particulate air pollution in pregnancy. Reviews of the prenatal environment describe similar patterns. That is genuine signal that these engines are sensitive to what surrounds them. It is not a reason to panic about every product in your house.
What I would actually do, in order
Foundational Five first. Always. Sleep, airway, nutrition, hydration, movement. No test changes the fact that a child who is not breathing well at night and not eating protein will stay tired.
One: fix the night
Say the word snoring out loud to your provider. Watch your child sleep for ten minutes. A stretched-back neck, an open mouth, restlessness, sweat, or noise is worth reporting. Then get bedtime consistent, get the room dark, and get screens out of the last hour.
Two: feed the factory
Protein at every meal, including breakfast. Real fats. Color on the plate. If your child's food list is very short, that is not stubbornness and it is not your failure. It is something to work on gently over months, not force in a week.
Three: move, without wrecking them
Movement builds more mitochondria over time. That is one of the best-established findings in this whole area. But a depleted child pushed into hard exercise crashes. Start short and daily rather than long and heroic.
Four: lower the obvious load
The changes with the best ratio of effort to benefit are boring. Open the windows. Skip the fragrance plug-ins. Wash new clothes before they get worn. Store food in glass instead of reheating it in plastic. Filter the drinking water. You do not need to do all of it, and you certainly do not need to do it perfectly.
Five, and only now: testing
If a child has done all of that and is still flat, I look further. Organic acids testing can be useful here when the picture calls for it, alongside iron studies and a look at the gut. I don't order a fixed panel, because there isn't one. There is your child and the story you have told me.
The part I most want you to hear
Tired is not a personality. It is not laziness and it is not a discipline problem. If your child is sleeping and still cannot get going, their body is telling you something, and it is reasonable to go looking.
I work in conjunction with your child's pediatrician, therapies, therapists, and specialists, not as a replacement for them. And I will never tell you this is just how it is. More often than not, that is not true.
Written by Dr. Amy Patton, Founder Happy Kid Functional Medicine
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About the author
This article was written by Dr. Amy Patton, DNP, APRN, CPNP-PC, FMACP, a board-certified pediatric nurse practitioner and functional medicine provider serving Omaha-area families through Happy Kid Functional Medicine. Dr. Patton specializes in root-cause pediatric care for children's gut health, sleep, behavior, nutrition, immune patterns, and whole-child wellness. She sees patients in person in Omaha and by telehealth across Arizona, Colorado, Iowa, Nebraska, Tennessee, and Virginia.
References
Kanungo S, Morton J, et al. Mitochondrial disorders. Ann Transl Med. 2018;6(24):475.
Frye RE, Rincon N, et al. Biomarkers of mitochondrial dysfunction in autism spectrum disorder: a systematic review and meta-analysis. Neurobiol Dis. 2024;197:106520.
Hu C, Sheng X, et al. Effects of prenatal exposure to particulate air pollution on newborn mitochondrial DNA copy number. Chemosphere. 2020;253:126592.
Smith AR, Hinojosa Briseño A, et al. The prenatal environment and its influence on maternal and child mitochondrial DNA copy number and methylation: a review of the literature. Environ Res. 2023;227:115798.
Medical disclaimer: This article is educational and is not medical advice. It does not diagnose, treat, or replace individualized care from your child's pediatrician or licensed medical provider. Supplement types, doses, and combinations should be selected with a qualified clinician who knows your child's full history — never start a new supplement based on a blog post alone. Always consult your pediatrician before making changes to your child's routine, and seek prompt medical care for snoring with gasping or pauses in breathing during sleep, or for any severe, sudden, or concerning symptom.
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