What if crushing fatigue isn’t about getting older or needing another cup of coffee?
What if the real problem is happening deep inside cells, where mitochondria—those tiny energy factories—have shifted into survival mode instead of energy production?
Dr. Ashley Frawley, a primary care physician who works outside traditional insurance constraints, recently broke down exactly how this happens, why it matters, and what can be done to reverse it.
Her explanation might change how people think about fatigue, performance, and aging.
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Mitochondria Don’t Just Make Energy—They Make Choices
Most people learned in high school biology that mitochondria are the “powerhouses of the cell.” They convert food and oxygen into ATP, the energy currency that fuels nearly everything the body does.
But what doesn’t get taught is that mitochondria aren’t blindly churning out energy. They’re constantly deciding whether to prioritize energy production or self-protection.
When the environment looks safe, they can focus on producing energy, clearing out old mitochondria that no longer work well through mitophagy, and building healthier new ones through mitochondrial biogenesis. But when they detect danger, they shift their priorities.
Dr. Frawley emphasized that mitochondria don’t care about weight loss goals or workout plans. When they sense a threat, survival comes first.
How To Tell If Mitochondria Are Struggling
There are specialized tests available—cheek swabs that analyze mitochondrial function—but they cost around $700, and their real-world validity is still being established.
For most people, simpler indicators are more practical:
- Waking up feeling unrecovered
- Afternoon energy crashes despite caffeine
- Workouts becoming unusually difficult
- Declining heart rate variability (HRV)
- Rising resting heart rate
- Decreasing VO2 max
Are you more fatigued than you should be given your circumstances?
That single question might be the most telling of all.
Five Major Threats That Push Mitochondria Into Defense Mode
1. Too Much Fuel Flooding the System
Imagine a five-lane freeway suddenly merging into two lanes during rush hour. That’s what happens when food arrives faster than mitochondria can process it.
Inside mitochondria, electrons from food move through the electron transport chain—like a factory assembly line producing energy. When overloaded, electrons leak out and react with oxygen, creating reactive oxygen species (ROS).
A few sparks are normal. Too many become destructive.
Dr. Frawley referenced research by Michael Brownlee, who proposed that chronic high blood sugar overloads mitochondrial metabolism, increasing production of a reactive oxygen species called superoxide. This unified mechanism helps explain how diabetes leads to heart disease, eye disease, and kidney disease—all rooted in mitochondrial dysfunction.
This isn’t about occasionally eating dessert. It’s about chronically sending more fuel than mitochondria can handle, especially with insulin resistance.
2. Damaged Mitochondrial Membranes
Mitochondria have two membranes. The inner membrane, where energy production happens, contains cardiolipin—a phospholipid that acts like scaffolding holding everything together.
When cardiolipin gets damaged, the membrane weakens and energy production suffers.
What damages these membranes?
- Excessive oxidative stress
- Poor-quality dietary fats from ultra-processed foods
- Pollution and heavy metals
- Infections (viral, bacterial, fungal)
- Certain medications like fluoroquinolones
- Chronic stress and poor sleep
When you eat highly processed foods, it’s like you’re building the foundation of your energy factories out of untreated dry wood instead of reinforced steel.
3. Persistent Inflammation and Infection
Inflammation isn’t always bad—it’s how the body heals from cuts or fights viruses. But during immune responses, cells shift ATP production toward glycolysis, a fast but inefficient method that happens outside mitochondria.
Glycolysis produces about 2 ATP molecules. The mitochondrial pathway produces around 30.
During infection, mitochondria get partially repurposed from energy production to coordinating defense, inflammatory signaling, and damage control. The factory doesn’t shut down—it becomes a command center and weapon system.
Problems arise when inflammatory mode never switches off. Persistent inflammation, lingering infections, or chronic stress keep sending danger signals.
Their energy factories may still be diverting resources towards defense.
This may explain why people with long-haul viral symptoms and chronic inflammatory conditions often describe similar experiences: fatigue, brain fog, poor exercise tolerance, slow recovery.
4. Inadequate Recovery and Sleep
Mitochondria aren’t only producing energy during waking hours. They’re constantly repairing, recycling, fusing, dividing, and adapting.
Sleep is the maintenance shift for cellular factories.
During sleep, slightly damaged mitochondria fuse with healthier ones (mitochondrial fusion). Severely damaged ones get isolated and recycled through mitophagy—the cell’s internal cleanup system.
Mitochondrial quality control becomes less efficient with age. Chronic sleep deprivation or constant stress makes it even worse. Damaged factories don’t get repaired, trash accumulates, and cells can’t provide full energy the next day.
Research shows this happens quickly. Even short periods of sleep restriction can impair mitochondrial function and antioxidant defenses.
5. Having Nothing To Do
Cells adapt to demand. Exercise signals that more energy capacity is needed, activating pathways that improve mitochondrial function and stimulate creation of new mitochondria (mitochondrial biogenesis).
Remove that demand, and the body has no reason to maintain a large energy production system.
Why employ 100 factory workers when there’s no demand for products?
The encouraging news: mitochondrial response to increased demand begins very quickly. Even one workout can substantially increase activity of PGC1-alpha, a major regulator of mitochondrial biogenesis.
You do not have to wait 6 months for your cells to notice if something has changed. They notice immediately and get to work.
Muscle mass matters too. Muscle is packed with mitochondria, so maintaining and using metabolically active muscle tissue creates ongoing demand for healthy mitochondrial function.
How To Fix Mitochondrial Dysfunction
Every problem Dr. Frawley outlined offers clues for solutions. Here’s her step-by-step approach:
Step One: Improve Metabolic Environment
Stop flooding mitochondria with excess food. Give the body defined eating times instead of constant snacking or calorie-filled beverages throughout the day.
When eating, focus on:
- Adequate protein
- Healthy fats like fish
- Antioxidants from berries and colorful vegetables
- Minimal processed foods
Step Two: Identify Major Stressors
Don’t try to fix everything at once. Identify the biggest source of stress and start there:
- Insulin resistance?
- Poor sleep?
- Inflammatory condition?
- Lingering infection?
- Medication side effects?
- Chronic stress?
Step Three: Protect Recovery Through Sleep
Dr. Frawley emphasized that sleep conversations dominate her patient interactions. She recommends tracking sleep with devices like Whoop, Oura Ring, or Garmin to identify trends.
This is also where supplements may help. Dr. Frawley introduced urolithin A, a compound produced when gut bacteria metabolize components found in pomegranates, berries, and walnuts.
Not everyone has the right gut bacteria to produce meaningful amounts. Research suggests urolithin A supports mitophagy—the process of recycling damaged mitochondria.
Timeline created Mitopure, a purified form of urolithin A studied in multiple human clinical trials. Studies showed improvements in muscular endurance, strength, exercise performance, and mitochondrial biomarkers in older and middle-aged adults.
Other supplements worth discussing with a doctor:
- CoQ10 – participates in electron transport chain and protects membranes
- NAD – critical for mitochondrial function
Step Four: Build More Mitochondria
The body won’t build mitochondria without demand. Exercise is the clearest signal.
Weightlifting and resistance training help maintain or gain muscle, which houses more mitochondria and increases energy-producing capacity.
Other strategies that create adaptive demand:
- Cold exposure
- Sauna use
- Red light therapy
These don’t replace exercise but may activate pathways that protect and preserve mitochondrial function.
Advanced tools include targeted mitochondrial peptides like SS-31 (elamipretide) and MOTS-c, but Dr. Frawley warned against self-experimentation with random internet peptides. Professional guidance is essential.
How To Know If It’s Working
Feeling better actually matters, even without lab reports proving exactly what changed inside mitochondria.
Look for patterns:
- More consistent energy throughout the day
- Faster recovery after workouts
- No more daily crashes
- Greater resilience to demands
Those are signs the system is adapting.
Your mitochondria are listening to the environment that they’re in every day. Give them a reason to make energy again.
When mitochondria sense overload, damage, inflammation, or insufficient recovery, they protect themselves. But when threats are reduced and demand increases, they respond by becoming stronger.
The key is creating an environment where mitochondria feel safe enough to shift from survival mode back to energy production—and then giving them a compelling reason to build more capacity.
