Most people have never heard of mitochondrial dysfunction.
Yet scientists increasingly believe it may be quietly influencing some of the world’s most common health problems from diabetes and heart disease to chronic fatigue, depression and neurodegenerative disorders.
For Bangladesh, where rates of diabetes and cardiovascular disease continue to rise and persistent fatigue is often dismissed as a normal part of life, the growing interest in mitochondria raises an important question: “what happens when the body’s energy factories begin to fail?”
School biology classes often introduce mitochondria with a simple phrase: “the powerhouse of the cell.”
The description is accurate, if incomplete.
The human body contains roughly 37 trillion cells, and inside most of them are tiny structures called mitochondria.
Their job is to convert food into usable energy, stored in a molecule known as ATP.
Every heartbeat, every breath, every movement and every thought depends on that process.
When mitochondria function efficiently, the body has the energy it needs to maintain healthy organs, support immunity and perform countless tasks that often go unnoticed.
But when that system begins to falter, the consequences can ripple throughout the body.
Scientists refer to this as mitochondrial dysfunction, a state in which cells struggle to produce energy efficiently.
Sometimes the cause is genetic. Increasingly, however, researchers are finding links between mitochondrial dysfunction and modern lifestyles.
Air pollution, poor nutrition, chronic stress, inadequate sleep and physical inactivity are all thought to contribute to cellular damage that interferes with energy production.
One of the leading suspects is oxidative stress, a process driven by unstable molecules known as free radicals.
These molecules accumulate through exposure to pollution, ultra-processed foods, smoking, chronic psychological stress and sleep deprivation.
Over time, they can damage cellular structures, including mitochondria themselves.
The organs that demand the most energy appear especially vulnerable.
The brain, for example, consumes around 20% of the body’s total energy despite accounting for only a small fraction of body weight.
Researchers are exploring possible links between impaired mitochondrial function and conditions such as depression, cognitive decline and chronic fatigue.
The heart presents a similar challenge.
Beating more than 100,000 times each day, it requires a constant supply of energy.
Studies suggest mitochondrial dysfunction may contribute to conditions including heart failure and hypertension, alongside many other risk factors.
The implications may be particularly relevant for Bangladesh.
The country now has one of the highest burdens of type 2 diabetes in South Asia.
Research suggests impaired mitochondrial function in muscle and liver cells may contribute to insulin resistance, one of the key biological mechanisms underlying the disease.
Meanwhile, many of the risk factors associated with mitochondrial dysfunction are increasingly common in everyday Bangladeshi life.
Dhaka’s air pollution consistently ranks among the worst in the world.
Nutritional deficiencies remain widespread.
Long working hours, chronic stress, sleep disruption and growing dependence on ultra-processed foods have become familiar features of urban living.
For many people particularly women persistent exhaustion is often dismissed as stress, overwork or emotional strain rather than investigated as a potential health concern.
The good news is that mitochondria are remarkably responsive to lifestyle changes.
Research shows that moderate aerobic exercise, including brisk walking for 30 minutes a day, can increase both the number and efficiency of mitochondria.
Diets rich in leafy vegetables, fish, lentils and other nutrient-dense foods provide essential building blocks for cellular energy production.
Quality sleep gives the body time to repair cellular damage, while stress management helps reduce the biological burden created by chronic cortisol exposure.
Scientists are still uncovering the full role mitochondria play in human health. But one lesson is already becoming clear: health begins long before disease appears.
Deep inside every cell, billions of microscopic power stations are working continuously to keep the body running.
The choices people make each day what they eat, how they sleep, how they move and how they manage stress may determine just how well those power stations continue to perform.
Fahima Hossain Muna is a health‑content writer and researcher