Optimising Mitochondrial Health: The Key to Sustained Energy and Longevity

Every cell in your body (except red blood cells) contains mitochondria—tiny organelles responsible for producing the energy currency your body runs on: ATP. A single cell can contain anywhere from a few hundred to several thousand mitochondria, depending on its energy demands.

When mitochondria are healthy and abundant, you have:

• Sustained energy throughout the day
• Sharp mental clarity
• Efficient metabolism
• Robust immune function
• Slower biological ageing

When mitochondrial health declines, everything suffers.

Mitochondrial dysfunction doesn't announce itself with a specific diagnosis. Instead, it manifests as:

• Persistent fatigue that doesn't improve with rest
• Exercise intolerance — feeling worse after activity
• Brain fog and cognitive decline
• Muscle weakness or pain
• Slow recovery from illness or injury
• Premature ageing — looking and feeling older than your years
• Metabolic issues — weight gain, blood sugar problems

These symptoms are often dismissed as "just getting older" or attributed to stress. But they frequently indicate mitochondria that need support.

Understanding mitochondrial health requires knowing that these organelles are dynamic:

Biogenesis (Creating New Mitochondria)

Your body constantly makes new mitochondria. This process is stimulated by:

• Exercise (especially high-intensity and endurance)
• Cold exposure
• Fasting and caloric restriction
• Certain nutrients and compounds

Mitophagy (Clearing Damaged Mitochondria)

Old or damaged mitochondria need to be recycled. This cleanup process is promoted by:

• Fasting and time-restricted eating
• Exercise
• Quality sleep
• Specific nutrients (spermidine, urolithin A)

Fusion and Fission

Mitochondria constantly merge and divide, sharing components and adapting to energy demands. This dynamic process keeps the mitochondrial network healthy.

CoQ10 (Ubiquinone/Ubiquinol)

Essential for the electron transport chain. Levels decline with age and statin use.

• Ubiquinol form is better absorbed
• Typical dose: 100-300mg daily
• Take with fat for absorption

B Vitamins

Multiple B vitamins are required as cofactors:

• B1 (thiamine) — Entry into Krebs cycle
• B2 (riboflavin) — Electron transport
• B3 (niacin) — NAD+ production
• B5 (pantothenic acid) — Acetyl-CoA formation

Magnesium

Required for ATP synthesis and utilisation. Most people are deficient.

Alpha-Lipoic Acid

Powerful antioxidant that works in both water and fat-soluble environments. Supports Krebs cycle enzymes and regenerates other antioxidants.

Acetyl-L-Carnitine

Shuttles fatty acids into mitochondria for burning. Particularly important for brain and heart.

PQQ (Pyrroloquinoline Quinone)

Stimulates mitochondrial biogenesis—actually helps create new mitochondria.

Exercise

The most powerful stimulus for mitochondrial biogenesis. Both high-intensity intervals and steady-state endurance training help, through different mechanisms.

Cold Exposure

Cold activates brown fat and stimulates mitochondrial production. Cold showers, ice baths, or just turning down the heating can help.

Time-Restricted Eating

Eating within a compressed window (e.g., 8-10 hours) promotes mitophagy during the fasting period, clearing damaged mitochondria.

Sleep

Mitochondrial repair and regeneration occur during sleep. Poor sleep quality directly impairs mitochondrial function.

Heat Exposure

Sauna use activates heat shock proteins that support mitochondrial health and stimulate cleanup processes.

Understanding what harms mitochondria helps you avoid these factors:

• Chronic stress — Cortisol impairs mitochondrial function
• Poor sleep — Disrupts repair processes
• Sedentary behaviour — Mitochondria atrophy without demand
• Toxins — Heavy metals, pesticides, mould toxins
• Nutrient deficiencies — Missing cofactors create bottlenecks
• Chronic inflammation — Inflammatory cytokines damage mitochondria
• Excess alcohol — Directly toxic to mitochondria
• Processed foods — Lacking nutrients while promoting inflammation

Standard blood tests don't assess mitochondrial performance. The Organic Acids Test (OAT) provides insight by measuring:

• Krebs cycle intermediates (shows where blockages exist)
• Markers of oxidative stress
• Nutrient cofactor status indicators

This testing is included in our Metabolic Deep Dive and helps identify specific support strategies.

Optimising mitochondrial health isn't about one supplement or hack. It requires:

1. Addressing nutrient cofactor status — Testing and correcting deficiencies

2. Reducing toxic burden — Minimising exposures, supporting detoxification

3. Managing inflammation — Anti-inflammatory diet and lifestyle

4. Stimulating biogenesis — Exercise, cold, fasting

5. Promoting mitophagy — Time-restricted eating, sleep optimisation

6. Protecting from oxidative damage — Adequate antioxidant support

At Metabolic Physio, we assess mitochondrial function markers through the Organic Acids Test and develop targeted strategies based on your results. If persistent fatigue is affecting your quality of life, mitochondrial health may be the missing piece.