Years of metabolic research in 20 minutes (we’ve been wrong)

I believe much of chronic disease and dysfunction is being understood at the wrong level.

Not necessarily the wrong facts.

But the wrong level.

And you’ll realize that a lot of conditions that look unrelated turn out to be the same problem.

In this article, I’m going to teach why we’ve been getting it wrong for years. I’ll be distilling years of research into 20 minutes.

My name is Andrew Reid. I’m the founder of Medgeeks. I trained as a physician assistant, have a graduate degree in nutrition, have had over 100,000 patient and client visits in my career, and have taught the science of health and disease to over 10,000 clinicians.

With that said, let’s start with first principles.

We like to think about health and disease as a collection of organ systems. But an organ is made up of a collection of tissues. And tissues are made up of a collection of cells. We have trillions of living cells doing an extraordinary amount of work every second.

Muscle cells contract and rebuild.

Immune cells identify threats, mount a response, and then stand down.

Hepatocytes process nutrients and toxins.

Neurons in the brain hold electrical gradients and fire signals.

They also build thoughts, regulate emotion, and generate motivation.

And every cell has to maintain itself, repair damage, replace worn parts, and adapt to changing demand.

None of that happens for free.

A living cell is a pocket of order held against the natural tendency toward disorder, and the currency that keeps that order intact is ATP.

Every ion gradient that lets a neuron fire, every protein folded or cleared, every membrane patched, every immune response that begins and resolves, every heartbeat and every act of repair has to be paid for metabolically.

Remove the ability to make and use that energy, and biological organization begins to collapse.

So metabolism is not one system among many. It is the process that lets every other system function.

The body does not simply have a metabolism. The body is metabolism organized into human form.

At the center of that network sit the mitochondria, and while calling them the power plants of the cell is true, it is incomplete.

They are closer to command centers that live inside the cell. They read the internal and external environment through calcium flux, redox state, nutrient availability, reactive oxygen load, and molecular danger signals.

What they read helps determine what the cell can afford to do next. Should it grow or conserve, build or defend, repair or die?

Cytochrome c is a small protein found inside mitochondria that helps shuttle electrons from complex III to IV. But its release outside the mitochondria commits a cell to apoptosis, or programmed cell death.

Cardiolipin is a phospholipid found in the inner mitochondrial membrane that helps stabilize energy production. When it ends up outside the mitochondria, it acts as a danger signal that activates innate immunity, and so do mitochondrial DNA and extracellular ATP.

These are just a few examples that showcase how the organelle that makes your energy is the same one that decides whether cells build, defend, repair, or sacrifice themselves.

Energy production and cellular decision-making are two sides of one biological process.

When energy supply falls short of demand, or when spending freely would threaten the cell’s stability, it rarely fails in one dramatic event.

It adapts quietly.

It begins rationing.

It protects the functions required for immediate survival and cuts spending on the expensive processes that are not essential in that moment: deep repair, growth, reproduction, complex cognition, emotional range, physical performance, immune regulation, and long-term resilience.

And those expensive functions are the ones we experience as being well.

What a person calls feeling bad is often the felt experience of a system that has stopped paying for the expensive things.

Fatigue is the most direct example. It is the conscious experience of demand exceeding available capacity, not simply a shortage of calories.

Brain fog follows the same logic. The brain is about 2% of body weight and burns roughly 20% of resting energy.

Its neurons hold steep electrical gradients they cannot switch off between thoughts, and they store almost no fuel locally, so when energy production or delivery is constrained, cognition is one of the first places the strain shows.

Mood and motivation are also affected. Producing neurotransmitters, packaging and releasing them, recycling them, and restoring membrane gradients all cost energy, and the brain continuously calculates whether an action is worth the energy required to perform it.

What we call low drive or anhedonia may be more than someone’s attitude. It can be a nervous system reducing expenditure because it does not perceive enough capacity to sustain effort safely.

The location of the symptom tells you where the strain is being expressed.

But it does not tell you where the deepest constraint began.

This is why diseases that look nothing alike share overlapping metabolic biology.

The lesion differs by tissue.

But the substrate underneath does not.

Type 2 diabetes is diagnosed through glucose measurements, but at its core, it is a disorder of energy handling, in which the liver, muscle, fat, and pancreas must sense, store, and oxidize fuel appropriately.

Insulin resistance can be read, in part, as cells becoming less willing to accept more substrate when they are already struggling to process what is present safely.

Alzheimer’s presents as memory loss, yet cerebral glucose hypometabolism shows up on PET scans early, often before plaque burden can explain the clinical picture. The energy problem is visible before the classic lesion accounts for the symptoms, which is why the type 3 diabetes label stuck.

Parkinson’s presents with movement symptoms, but the affected neurons maintain long axons, manage large calcium loads, recycle dopamine, and control oxidative stress for decades. It carries one of the more reproducible findings in neurology, complex I dysfunction in the substantia nigra, and the familial genes PINK1 and Parkin govern mitochondrial quality control directly.

Depression is defined through mood and behavior, and those experiences emerge from metabolically active neural and immune networks. Inflammation, insulin resistance, and altered mitochondrial respiration keep turning up in the research. Now, the condition is heterogeneous, so metabolic dysfunction isn’t the whole story, but it is a real thread running through at least some forms of it.

Autoimmune disease is classified by which tissue is attacked, yet whether an immune cell becomes inflammatory, regulatory, or exhausted is inseparable from its metabolism, from whether it runs on glycolysis or oxidative phosphorylation. Change the cell's metabolic state, and you can change what it becomes and how aggressively it drives inflammation.

Different diagnoses. Different organs. Different symptoms.

Underneath, the cells are answering the same questions.

Can I produce enough energy?

Can I match supply to demand?

Can I use the fuel that arrived safely?

Can I hold calcium, redox, and membrane stability?

Can I repair the damage being generated?

Can I adapt without becoming trapped in defense?

Do I have reserve left for the next stressor?

We divided these problems into specialties.

But underneath, every cell is asking one version of the same question.

Can I generate, direct, and recover enough capacity to do my job while still handling whatever stress comes my way?

The cell danger response is one framework for what happens when the answer becomes no.

It comes from the work of Dr. Robert Naviaux at UC San Diego and describes a cell under threat.

When a cell perceives infection, injury, toxic exposure, or severe nutrient stress, its metabolism changes.

Resources are redirected away from routine growth and maintenance and toward defense.

Membrane behavior changes, communication changes, and the cell becomes more guarded and less willing to invest in normal rebuilding.

Acutely, this is protective.

You want cells to interrupt ordinary life when a threat is present.

But a defense program is supposed to resolve.

One way to understand chronic dysfunction is as a protective response that has outlived its usefulness, a cell or tissue still behaving as though danger is present after the original trigger has passed. This is rationing that never got switched back off.

In that state, the body is not idle. It is actively paying for defense at the expense of growth, repair, and restoration.

Which means health is not simply the absence of active disease.

Returning to health is an active process that must be financed with energy.

Resolving inflammation costs energy.

Rebuilding a synapse costs energy.

Remodeling tissue costs energy.

Restoring a hormone axis, reestablishing immune tolerance, replacing damaged organelles, and adapting to exercise all draw on the same account.

Healing is not passive. It must be paid for.

A medication can block a receptor, replace a hormone, suppress inflammation, remove a pathogen, lower glucose, clear a plaque, or correct a laboratory value.

Those interventions can be necessary and sometimes lifesaving. But every one of them assumes a body capable of responding.

A medication delivers a signal, and the cell still has to execute the response.

Nutrients supply raw material, and the cell still has to transport and use them.

Exercise delivers a stimulus, and the tissue still has to adapt rather than merely accumulate more stress.

Sleep creates the opportunity for repair, but the body still has to carry it out.

The intervention is the instruction. Metabolism determines whether the system has the resources to carry it out.

This is why downstream treatment can move a marker without restoring the person.

A value normalizes while the fatigue, the poor recovery, and the vulnerability to stress remain.

The treatment moved a lever, but the system lacked sufficient capacity to translate that movement into full restoration.

Metabolism is not one lever among many. It is the precondition that decides how strongly every other lever can move the system.

Now let’s ground ourselves in the reality of the situation.

A foundation is not the whole house.

Strengthening it will not automatically repair every damaged room.

A fracture still needs stabilization. An infection may need an antimicrobial. But those are obvious, and nothing here is referring to injury or acute illness.

And you could push back with a fair objection. Isn’t almost everything necessary?

True. Plenty of things are.

But metabolism is distinctive because it is the work-producing and resource-allocating layer every living system has to operate through.

It is not just one more thing the body needs. It is the layer where every other system is paid for, and where their failures eventually come due.

The gut is not separate from any of this. I bring this up because many practitioners like to start with the gut.

I don’t disagree.

It is one of the most powerful regulators of the metabolic and inflammatory environment we have. The bacteria there ferment fiber into fuels like butyrate that your gut lining runs on, and they shape absorption, inflammation, and the signals reaching every other cell.

The relationship runs both ways. It is not a competing foundation. It is part of the same metabolic picture.

To be clear, I am not claiming that dysfunctional mitochondria are the origins of every single disease.

I am claiming that metabolic and mitochondrial capacity set the threshold between a stressor the body can absorb and one that becomes disease.

A trigger creates the burden.

Capacity determines how long the body can contain it.

Disease shows up when the burden finally exceeds what the system can compensate for.

And once it does, that same capacity shapes how far the damage goes, and whether the body can climb back out.

Whatever lights the match, the fire burns through metabolism.

And over time, the relationship stops being one-directional.

Whatever came first, the two feed each other, and the dysfunction becomes self-perpetuating.

This holds even for genetic disease. A mutation sets the vulnerability, but for many conditions, the timing and severity of that weakness correlate with the metabolic stress the cell is under.

The genome sets what could go wrong. Capacity, or the loss of it, often decides when it does.

Metabolic and mitochondrial function are the shared substrate that determines whether the body can maintain health, withstand stress, and execute repair.

They may not be the original cause of every known problem, but they shape how nearly every problem is expressed, how much damage it creates, and how completely the body can recover.

That is why metabolism sits beneath neurology, immunology, rheumatology, gastroenterology, cardiology, endocrinology, psychology, and even physical performance.

Not because it replaces those systems.

Those systems are real, and they regulate metabolism as much as it regulates them.

Regulation runs both ways.

But the energetic dependence is universal.

Every one of those systems shapes metabolism, and every one of them still needs metabolism to do its work.

Let’s start with an extreme because it’s something we can all agree with.

Cyanide kills in minutes by blocking complex IV of the electron transport chain. Without oxygen, the brain begins to die within minutes because oxidative ATP production ceases.

When energy production fails, ion pumps quit, gradients collapse, calcium runs uncontrolled, membranes destabilize, and the organized processes we call life begin to end.

The line between a living cell and a dead one lies in the ability to maintain order through continuous energy flux. Remove the flux, and what remains is chemistry without biological organization.

Chronic disease is not cyanide poisoning in slow motion.

But the extreme exposes the same governing principle.

Biological order holds only while cells can meet the energetic and signaling demands required to maintain it.

Not death in minutes, but degradation over years.

Not the absence of energy, but not quite enough of it, or not directed well enough, to pay for everything the cell is supposed to do.

Without metabolism, there is no thought. No repair. No recovery.

Without mitochondrial function, there is no human life.

Nothing living escapes metabolism, and no sustained recovery can bypass it.

Every symptom, every biological response, and every attempt at healing rests on the capacity of cells to produce energy, spend it intelligently, and recover from demand.

So before we argue about what to do, we have to see things correctly.

The unrelated diagnoses, the symptoms in different organs, the markers that move while the person doesn’t heal.

They are different manifestations that converge on the same underlying constraint.

We have to look one level deeper to see that it’s the same problem wearing different clothes. Miss that level, and every downstream fix eventually runs into the same ceiling.

So, the foundation is metabolic and mitochondrial health.

I hope this helps you view things a little differently.

And if this shifted how you see your own health, the next step is finding out where your capacity actually stands.

That’s why I created a free metabolic capacity assessment.

It’s a way to look one level down at your own system and see how much reserve you’re actually working with.

It’s completely free → https://medgeeks.co/get-started/metabolic-health/

Last thing.

If you’ve been diagnosed with a primary mitochondrial disease, then you should know I take on one client every month pro bono.

No cost, and no catch.

It’s a small way of giving another family the kind of careful attention I wish we’d had sooner for my daughter.

Pro bono mitochondrial disease health coaching → https://medgeeks.co/consult/primary-mitochondrial-disease/

To better health, with better science.