Mitochondrial health

I am passionate about Mitochondrial health and its pivotal role in health.  

Every cell contains hundreds to thousands of mitochondria that convert food into ATP, the energy currency powering nearly every cellular function. When mitochondrial function declines, energy production falls, inflammation increases, and cellular repair become less efficient.

Increasing evidence suggests mitochondrial dysfunction plays an important role in most chronic diseases, including cardiovascular disease, diabetes, neurodegenerative disorders, and most cancers.

How Mitochondria Work

Inside mitochondria, the electron transport chain extracts energy from food molecules and uses it to pump protons across the inner membrane, creating an electrical gradient. This gradient powers ATP synthase, a molecular turbine that generates ATP.

When functioning efficiently, this system produces remarkable amounts of energy with minimal waste. Healthy mitochondria not only provide ATP but also regulate cellular signaling, calcium balance, antioxidant defences, and programmed cell death.

Two Types of Mitochondria

Cells maintain two broad mitochondrial states, each optimised for different purposes.

Energetic Mitochondria

Energetic mitochondria prioritise ATP production and are dominant in tissues with high energy demands such as the heart, brain, muscles, and retina.

Biosynthetic Mitochondria

Biosynthetic mitochondria prioritise the production of cellular building blocks such as amino acids, nucleotides, and lipids required for growth and repair. They generate less ATP but support cell proliferation and tissue renewal. In healthy tissues, cells move fluidly between these states. When mitochondrial health deteriorates, however, this balance becomes disrupted and metabolic dysfunction can follow.

The Mitochondrial Health Crisis

Modern lifestyles often place mitochondria under continuous stress. Excess calorie intake, poor metabolic health, environmental pollutants, chronic stress, insufficient sleep, and certain medications can all increase oxidative stress and reduce mitochondrial efficiency. As mitochondria become overloaded, the electron transport chain operates less efficiently and generates increasing amounts of reactive oxygen species (ROS). 

Under normal circumstances, antioxidant systems neutralize these molecules. But chronic stress can overwhelm these defenses. The result is a vicious cycle: oxidative damage reduces ATP production, damaged mitochondria generate even more ROS, and inflammation increases throughout the body. 

Over time, cellular performance declines and susceptibility to chronic disease rises. Rather than emerging from a single cause, mitochondrial dysfunction is often the result of numerous small stressors accumulating over decades.

Beyond Diet: Other Stressors on Mitochondria

Diet is only one factor affecting mitochondrial health. A range of environmental and lifestyle stressors can increase oxidative stress, impair energy production, and accelerate mitochondrial damage.

• Air pollution and particulate matter can increase mitochondrial ROS production and inflammation. 
• Heavy metals such as mercury, lead, and cadmium can interfere with mitochondrial enzymes and energy metabolism.
• Chronic psychological stress and elevated cortisol can impair mitochondrial function while increasing oxidative damage.
• Sleep deprivation reduces mitochondrial repair, renewal, and antioxidant defences.
• Alcohol, certain medications, and environmental chemicals can increase mitochondrial stress and reduce ATP production.
• Endocrine-disrupting chemicals found in plastics and industrial compounds may negatively affect mitochondrial signalling and metabolism. 
• Electromagnetic Fields (EMF) and Radio Frequency Radiation: There is a growing body of research that suggests that electromagnetic fields and radiofrequency radiation from cell phones, WiFi networks, power lines, and cellular infrastructure may influence mitochondrial function. 

Individually, these stressors may have modest effects. Together, they can create a cumulative burden that gradually reduces mitochondrial efficiency and resilience.

Cancer and Mitochondrial Dysfunction

In 1924, biochemist Otto Warburg observed that many cancer cells rely heavily on glycolysis for energy production even when oxygen is available, a phenomenon now known as the Warburg Effect.

At first glance, this seems irrational. Glycolysis produces only around 2 ATP molecules per glucose, while healthy mitochondrial oxidation can produce more than 30. Yet cancer cells consistently shift toward this less efficient metabolic strategy.

One explanation is that chronic mitochondrial damage can impair normal oxidative metabolism. As mitochondrial function declines, cells may become increasingly dependent on glycolysis to meet their energy needs. At the same time, this metabolic shift provides many of the molecular building blocks required for rapid cellular growth and division.

Mitochondria also serve as critical regulators of apoptosis, the programmed cell death process that removes damaged or abnormal cells. Healthy mitochondria help determine when a cell should be repaired and when it should be eliminated. When mitochondrial signalling becomes impaired, abnormal cells may evade these quality-control mechanisms and survive longer than they should.

This does not mean mitochondrial dysfunction is the sole cause of cancer. Cancer is a complex disease involving genetic mutations, immune dysfunction, environmental exposures, inflammation, and altered cellular metabolism. However, mitochondrial dysfunction appears to be a major contributor that can create conditions favourable for cancer development, progression, and resistance to treatment.

Viewed through this lens, cancer can be seen partly as a disease of disrupted cellular energy and signalling. Genetic mutations undoubtedly matter, but the metabolic environment in which those mutations occur may be equally important. Mitochondrial dysfunction may therefore help explain why chronic inflammation, obesity, insulin resistance, environmental toxins, and ageing all increase cancer risk despite arising from very different origins.

Lifestyle Strategies to Protect and Restore Mitochondrial Health

While genetics influence mitochondrial function, lifestyle choices largely determine how much stress mitochondria face throughout life. The goal is not perfection, but reducing the cumulative burden that gradually erodes cellular energy production.

Avoid Chronic Caloric Overload

Mitochondria evolved to handle periods of abundance followed by periods of scarcity. Constant feeding, excessive calorie intake, and highly processed foods keep the electron transport chain continuously saturated. 

Reducing excess calorie intake, improving metabolic flexibility, and maintaining a healthy body composition can reduce mitochondrial stress, lower ROS production, and improve ATP generation efficiency.

Time-restricted eating, reducing ultra-processed foods, and improving overall dietary quality can help restore metabolic balance.

Prioritise Nutrient-Dense Foods

Mitochondria depend on a broad range of vitamins, minerals, amino acids, and fatty acids to function optimally. Foods rich in magnesium, B vitamins, omega-3 fats, polyphenols, and antioxidants help support mitochondrial function while protecting against oxidative stress. A diet based predominantly on whole foods provides a stronger foundation for mitochondrial health than one dominated by highly processed products. 

Include Fermented Foods Regularly

Fermented foods such as kefir, yoghurt, sauerkraut, and kimchi help support a diverse gut microbiome, which plays an important role in metabolic and immune health.

Beneficial gut bacteria produce compounds that can reduce inflammation, support mitochondrial function, and improve nutrient absorption. They may also help convert plant compounds found in foods such as pomegranates and walnuts into metabolites like urolithin A, which supports mitochondrial renewal.

Regularly including a variety of fermented foods in the diet may therefore help create a healthier internal environment for both mitochondrial and overall health.

Prioritise Sleep

Sleep is one of the body's most powerful mitochondrial repair mechanisms. During sleep, damaged mitochondria are repaired or removed, antioxidant systems are replenished, and cellular recovery processes accelerate. Consistently obtaining sufficient, high-quality sleep may be one of the most effective interventions available for preserving long-term mitochondrial function.

Use Light to Support Cellular Energy

Humans evolved under sunlight, and mitochondria appear responsive to specific wavelengths of light. Regular natural sunlight exposure helps regulate circadian rhythms, sleep, and metabolic function. Additionally, red and near-infrared light may support ATP production by stimulating cytochrome c oxidase within the electron transport chain. For individuals with limited sunlight exposure, appropriately designed red-light and near-infrared devices may provide an additional source of mitochondrial support.

Move Regularly

Exercise is one of the strongest stimulators of mitochondrial biogenesis, the creation of new mitochondria. Both aerobic exercise and resistance training increase mitochondrial number and efficiency while improving the body's ability to utilise energy effectively. Consistent movement is generally more beneficial than occasional bursts of extreme effort.

Reduce Environmental Toxin Exposure

Although complete avoidance is impossible, reducing exposure wherever practical may decrease cumulative mitochondrial burden. Helpful strategies include:

• Filtering drinking water.
• Choosing organic produce when feasible.
• Minimising exposure to pesticides and herbicides.
• Reducing plastic food storage, particularly when heating food.
• Avoiding tobacco smoke.
• Improving indoor air quality through ventilation and filtration.

Minimise Electromagnetic Exposure Where Practical

Given the uncertainty surrounding long-term EMF exposure, simple precautionary steps may be worthwhile:

• Avoid carrying mobile phones directly against the body for prolonged periods.
• Use speakerphone or wired headphones for lengthy calls.
• Avoid sleeping with phones beside the bed.
• Switch WiFi routers off overnight if practical.
• Remove unnecessary wireless devices from bedrooms.

Whether the benefit comes from reduced electromagnetic exposure, improved sleep quality, or both, these habits may support long-term recovery and resilience.

Manage Chronic Stress

Psychological stress eventually becomes biochemical stress. Persistent cortisol elevation increases oxidative stress, disrupts mitochondrial signalling, and impairs energy production. Meditation, breathing exercises, physical activity, social connection, time in nature, and deliberate recovery periods can help reduce this burden.

Promote Mitophagy and Mitochondrial Renewal

Protecting mitochondria is only half the equation. The body must also identify and remove those that are damaged beyond repair. 

Exercise, quality sleep, periods of fasting, and heat exposure such as sauna use all stimulate mitophagy, the cellular process that removes dysfunctional mitochondria and replaces them with healthier ones.

Urolithin A may further support this process by activating pathways involved in mitochondrial quality control. By enhancing the removal of damaged mitochondria and promoting mitochondrial renewal, it may help maintain ATP production, reduce oxidative stress, and support healthy ageing.

The goal is not simply to preserve existing mitochondria, but to continuously renew the mitochondrial network so that older, inefficient organelles are replaced by more functional ones.

The Unified Picture

Mitochondria sit at the centre of cellular energy production, repair, adaptation, and survival. Modern life exposes them to a wide range of pressures: excess calories, sedentary behaviour, pollution, chronic stress, sleep disruption, environmental toxins, and potentially other emerging stressors. 

Individually, these challenges may seem small. Together, they create a cumulative burden capable of impairing cellular energy production and resilience.

As mitochondrial function declines, ATP production falls, oxidative stress rises, inflammation increases, and the body's ability to maintain healthy tissues become compromised. 

Over time, this dysfunction may contribute to many of the chronic diseases associated with ageing. The encouraging news is that mitochondria are dynamic. They constantly adapt, repair, divide, and renew themselves. 

Through better nutrition, regular exercise, restorative sleep, stress management, toxin reduction, sunlight and infrared exposure, and support for mitophagy through strategies such as fasting and urolithin A, we may be able to maintain healthier and more efficient mitochondrial networks throughout life.

Rather than searching for a single cure, the most powerful approach is often to reduce the total burden placed upon mitochondria while enhancing the body's natural capacity for repair and renewal. By protecting cellular energy, we support the foundation upon which long-term health is built.