Why am I so exhausted - all the time? battling Fatigue

Why Do I Feel Exhausted All the Time?

A mitochondrial perspective inspired by Dr Scott Sherr

There is a particular kind of exhaustion that sleep does not fix.

You wake up tired. You push through the day on caffeine and willpower. You promise yourself an early night, only to find your mind wired and your body depleted. Over time, it begins to feel less like a phase and more like your baseline.

From a conventional lens, fatigue is often treated as a symptom to manage. From a functional and mitochondrial perspective, it is a signal. One that asks a more interesting question:

Is your body actually able to produce energy effectively?

 

The Mitochondrial Lens: Energy at the Cellular Level

At the centre of this conversation are mitochondria. These are the tiny structures inside your cells responsible for producing ATP, the energy currency your body uses for everything. Thinking, digestion, hormone production, detoxification, emotional regulation.

When mitochondria are functioning well, energy feels steady and accessible. Not hyper, not wired. Just quietly available.

When they are not, fatigue emerges. Not because you are lazy or unmotivated, but because your body is literally struggling to generate energy at a cellular level.

This is a core idea often emphasised by Dr Scott Sherr: fatigue is often not a lack of rest, but a problem of energy production.

 

Why Mitochondria Slow Down

Mitochondria are highly sensitive. They respond to the environment you create through your daily life. Over time, certain patterns begin to impair their function.

 

1. Chronic Stress and the Nervous System

Your body was designed for short bursts of stress, not constant activation.

When you live in a prolonged state of fight or flight, cortisol remains elevated. Blood sugar becomes unstable. Inflammation increases. All of this places a heavy burden on mitochondria.

Eventually, the system downregulates.

Fatigue becomes protective.

 

2. Blood Sugar Instability

Frequent spikes and crashes in blood glucose force your mitochondria into a reactive mode.

Instead of steady, efficient energy production, your body becomes dependent on quick fuel. You feel energised briefly, then depleted again. Over time, this cycle reduces metabolic flexibility and mitochondrial resilience.

 

3. Inflammation and Immune Activation

Low grade inflammation, whether from gut dysfunction, environmental toxins or unresolved infections, diverts energy away from daily function and toward immune defence.

Your body prioritises survival over vitality.

Energy is not lost. It is redirected.

 

4. Nutrient Deficiencies

Mitochondria require specific nutrients to function. B vitamins, magnesium, CoQ10, iron, amino acids.

Without these, the biochemical pathways that produce energy slow down. Even if you are eating well, absorption and utilisation matter just as much.

 

5. Poor Sleep Quality

Sleep is when mitochondria repair and regenerate.

Not just duration, but depth matters. Fragmented or shallow sleep means your cells never fully reset. Over time, this creates a cumulative energy deficit.

 

6. Environmental Load

Toxins, pollutants, and even excessive blue light can impair mitochondrial signalling.

This is less about a single exposure and more about cumulative burden. The body becomes less efficient at managing both energy and detoxification.

 

The Subtle Signs of Mitochondrial Dysfunction

This kind of fatigue rarely exists in isolation. It tends to come with a pattern.

You might recognise some of these:

• Brain fog or difficulty concentrating
• Reliance on caffeine to function
• Feeling “wired but tired” at night
• Poor stress tolerance
• Slow recovery from exercise or illness
• Hormonal imbalances
• Mood fluctuations or low resilience

These are not separate issues. They are different expressions of the same underlying energy imbalance.

 

Why Rest Alone Is Not Enough

One of the most frustrating aspects of this kind of exhaustion is that traditional advice does not seem to work.

Sleep more. Take a holiday. Reduce your workload.

These can help, but they do not address the root issue if your mitochondria are not functioning optimally.

Rest is necessary.

But rest without repair does not restore energy.

 

Rebuilding Energy at the Root

The shift here is subtle but powerful. Instead of asking, “How do I get more energy?” the question becomes:

“How do I support my body to produce energy more efficiently?”

From a functional perspective, this is where change begins.

 

Stabilising the Nervous System

Energy production improves when the body feels safe.

Practices like breathwork, time in nature, gentle movement, and reducing overstimulation begin to shift your baseline from stress to regulation.

 

Supporting Blood Sugar Balance

Eating in a way that stabilises glucose is foundational.

Protein rich meals, healthy fats, and reducing excessive refined carbohydrates create a more stable energy environment for mitochondria to function.

 

Restoring Nutrient Status

Targeted nutritional support can make a meaningful difference.

This might include magnesium, B vitamins, omega 3s, or CoQ10, depending on the individual. Quality and bioavailability matter here.

 

Improving Sleep Depth

Not just more sleep, but better sleep.

Consistent sleep and wake times, reduced evening light exposure, and calming pre sleep routines help restore the body’s natural rhythms.

 

Reducing Inflammatory Load

This often involves looking at gut health, food sensitivities, and lifestyle factors that may be quietly contributing to inflammation.

 

Gentle Movement, Not Overtraining

Exercise supports mitochondrial health, but only when it matches your capacity.

For someone already depleted, intense training can worsen fatigue. The body responds better to gradual, consistent movement that builds resilience over time.

 

A Different Relationship With Energy

One of the most important shifts in this work is psychological.

Fatigue is often met with resistance. Frustration. Self judgement.

But from this perspective, fatigue is not failure. It is feedback.

Your body is not working against you. It is communicating with you.

 

Bringing It Back to You

If you feel exhausted all the time, it is worth pausing before reaching for another quick fix.

Ask instead:

• Is my body under constant stress?
• Am I fuelling myself in a way that supports stable energy?
• Am I giving my system the conditions it needs to repair?

 

Energy is not something you force.

It is something you create the conditions for.

And when those conditions begin to shift, even slightly, something interesting happens.

Energy does not rush back all at once.

It returns quietly. Steadily. Sustainably.

The way it was always meant to.

By Dr Leah Murray