Mitochondria: The Engine Behind Your Energy
Mitochondria: The Engine Behind Your Energy
Ever wonder why some days you can power through back-to-back meetings and a gym session, while other days even climbing the stairs at the MRT station feels like a chore? A big part of the answer lies in structures inside your cells called mitochondria.
What Is Mitochondria?
Mitochondria are tiny structures found inside almost every cell in your body, and their main job is turning the food you eat into energy your cells can actually use.
Mitochondria are structures within cells that convert the energy from food into a form that cells can use, and each cell contains hundreds to thousands of mitochondria. Think of them as tiny power stations working around the clock inside your muscles, brain, heart, and every other organ.
They do this through a process called oxidative phosphorylation, which sounds technical but is simply the way mitochondria use oxygen and nutrients from your last meal — say, that plate of nasi lemak or char kway teow — to produce a molecule called ATP. Thirteen genes in mitochondrial DNA provide instructions for enzymes involved in oxidative phosphorylation, a process that uses oxygen and simple sugars to create adenosine triphosphate (ATP), the cell's main energy source. ATP is essentially the currency your cells spend on everything from thinking clearly to walking briskly across a hawker centre.
Interestingly, mitochondria carry their own small set of genetic material, separate from the DNA in the rest of your cells. Although most DNA is packaged in chromosomes within the nucleus, mitochondria also have a small amount of their own DNA, known as mitochondrial DNA, which spans about 16,500 base pairs. This mitochondrial DNA is passed down from mother to child and is especially vulnerable to wear and tear over time.
Why Does Mitochondrial Health Matter?
Powering everyday energy
Mitochondria are responsible for the bulk of the energy your body generates each day, which is why they're often nicknamed the cell's power plant. When mitochondrial function dips, the most common complaint is simply feeling drained. Loss of function in mitochondria, the key organelle responsible for cellular energy production, can result in the excess fatigue and other symptoms that are common complaints in almost every chronic disease. For busy PMEBs juggling long work hours with little downtime, understanding this link between cellular energy and everyday fatigue can be a helpful reframe.
Managing oxidative stress
Energy production isn't free of side effects — it generates natural byproducts called reactive oxygen species. This damage results from a buildup of harmful molecules called reactive oxygen species, which are byproducts of energy production in mitochondria, and mitochondrial DNA is especially vulnerable because it has a limited ability to repair itself. Nutrients that support your body's antioxidant defences, such as coenzyme Q10, work partly inside the mitochondria itself to help manage this ongoing wear and tear.
Supporting healthy ageing
As you get older, the number and efficiency of your mitochondria naturally decline, which is one reason recovery from illness or exertion can take longer than it used to. A buildup of somatic variants in mitochondrial DNA has been associated with some forms of cancer and an increased risk of certain age-related disorders such as heart disease, Alzheimer's disease, and Parkinson's disease. This is part of the reason regular health screenings, such as those offered under Singapore's Screen for Life programme, become more valuable as the decades add up — catching age-related changes early matters when your cellular engines are naturally slowing down.
Muscle and physical performance
Muscle cells are packed with mitochondria because movement demands a steady, reliable energy supply. Nutrients traditionally studied alongside mitochondrial function, like L-carnitine, play a role in shuttling fuel into these cellular power plants. The important role of l-carnitine in mitochondrial metabolism has spurred its use in supplements to potentially improve physical performance, since transport of fatty acids into mitochondria requires increased levels of l-carnitine. That said, evidence on whether supplementing actually boosts athletic performance in already well-nourished people remains mixed.
Bioavailability & Absorption
You can't "take" mitochondria as a supplement — they're structures your body builds itself. What people usually mean when they talk about supporting mitochondrial health is taking nutrients that mitochondria rely on to function well, most commonly coenzyme Q10, alpha-lipoic acid, and L-carnitine.
These compounds don't always move into cells as easily as hoped. Treatment with exogenous CoQ10 is often ineffective, likely due to its extreme hydrophobicity and high molecular weight, though less hydrophobic forms with shorter tails can serve as viable substitutes. In practical terms, this means how well a supplement works may depend heavily on its formulation, not just the ingredient list on the box. Fat-soluble nutrients like CoQ10 are also generally better absorbed when eaten alongside a meal containing some oil or fat — which, in the local context, is rarely a challenge given how much of our everyday cooking already uses oil.
Safety Basics
Nutrients associated with mitochondrial support are generally considered well tolerated by most healthy adults. No serious side effects of CoQ10 have been reported, though mild side effects such as insomnia or digestive upsets may occur.
Certain medications interact with these nutrients. CoQ10 may interact with the anticoagulant warfarin and the diabetes drug insulin, and it may not be compatible with some types of cancer treatment. If you're on blood thinners, insulin, or undergoing cancer treatment, always check with your doctor or pharmacist before adding any mitochondrial-support supplement to your routine.
People who are pregnant, breastfeeding, or managing chronic conditions such as heart disease should also speak with a healthcare professional first, since most of these nutrients haven't been thoroughly studied in those groups. If you notice ongoing, unexplained fatigue rather than the normal tiredness after a long day, it's worth raising with a doctor rather than self-treating with supplements — persistent fatigue can have many underlying causes that need proper evaluation.
Natural Food Sources
You can support your mitochondria through diet without needing a single supplement. Foods naturally rich in CoQ10 and related nutrients include:
- Oily fish such as salmon and mackerel, common in many local seafood dishes
- Organ meats like liver, occasionally featured in traditional Chinese and Malay cooking
- Nuts and seeds, an easy snack alternative to kaya toast for a mid-afternoon pick-me-up
- Whole grains, which also provide the steady-release carbohydrates mitochondria use for fuel
- Leafy green vegetables and colourful produce, which supply antioxidants that help manage oxidative stress
For the many Singaporeans and Malaysians eating out two or three times a day, small swaps — choosing grilled fish over fried options at the food court, or adding an extra vegetable dish at the hawker centre — can meaningfully shift your intake of these nutrients over time.
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Final Thoughts
Mitochondria don't often make it into everyday conversation, but they're working behind the scenes every time you get through a busy workday, a workout, or simply climb a flight of stairs without getting winded. Understanding how they function helps explain why fatigue, ageing, and energy levels are so closely connected at a cellular level.
You don't need to overhaul your life to support them — regular movement, a varied diet with some oily fish and whole grains, adequate sleep, and routine health screenings go a long way. If fatigue is persistent or unusual for you, that's a conversation for your doctor, not just your supplement cabinet.
This article is for general informational purposes and is not a substitute for professional medical advice. Please consult a qualified healthcare professional before making any changes to your diet or supplement routine.
References
- Mayo Clinic
https://www.mayoclinic.org/drugs-supplements-coenzyme-q10/art-20362602 - MedlinePlus
https://www.medlineplus.gov/genetics/chromosome/mitochondrial-dna/ - MedlinePlus
https://www.medlineplus.gov/mitochondrialdiseases.html - PubMed Central (NIH)
https://pmc.ncbi.nlm.nih.gov/articles/PMC10167337/ - PubMed Central (NIH)
https://pmc.ncbi.nlm.nih.gov/articles/PMC4566449/