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Have you ever wondered why some days you feel full of energy while on others, you can barely drag yourself out of bed? The answer might lie in tiny structures within your cells called mitochondria. These microscopic powerhouses support your overall health, energy levels, and even the aging process.
In this guide, we’ll explore what mitochondria are, their essential functions, and how supporting them can help you maintain energy levels while supporting healthy aging.
What Are Mitochondria?
Mitochondria are the miniature power stations or factories in each and every cell in your body. A typical living human cell contains anywhere from hundreds to thousands of mitochondria.
Mitochondria are like microscopic digestive systems in your cells, turning food into energy. Sugars, fats, and amino acids from the proteins that we eat are converted into energy through the mitochondria. They are so effective at this that they generate an estimated 90% of the energy that our cells need.⁽¹⁾
Mitochondria look like little beans in your cells. They are made of two membranes: the outer membrane and the inner membrane. The outer membrane acts as a wall, covering the entirety of the organelle. The inner membrane looks like a series of folds consisting of several compartments. This layered shape is intended to maximize the mitochondria’s surface area, supporting a higher efficiency in its function.⁽¹⁾
Within the inner membrane is a fluid called the matrix; this is where the magic happens.
What makes mitochondria particularly fascinating is their unique origin. Scientists believe mitochondria were once independent bacteria that formed a symbiotic relationship with other cells about 1.5 billion years ago. This theory, known as endosymbiosis, explains why mitochondria have their own DNA, separate from the cell's nucleus.⁽²⁾
The term "powerhouse of the cell" was first coined in 1957 by scientist Philip Siekevitz in a scientific paper, and the phrase stuck because it perfectly describes the mitochondria's primary role in energy production.⁽³⁾
What Is the Function of Mitochondria?
So, what do mitochondria do?
The mitochondria have one primary purpose: to produce energy. In order to create energy, they create a much-needed molecule known as adenosine triphosphate, or ATP.⁽¹⁾
Our bodies don’t just create and harness energy straight away. It actually stores the energy we produce from our food in a molecule.
ATP, or adenosine triphosphate, is the primary energy storage solution for our cells. They are like tiny batteries floating around, waiting to be used. “Tri,” meaning three, denotes that there are three phosphates in the molecular structure.
When cells need energy, ATP is broken down through a process called hydrolysis. This is actually pretty easy to do because ATP is such an unstable molecule. The three phosphates in ATP are like three roommates sharing a room. They don’t like each other and are just waiting to be split up.
When the split happens, the molecular bond between the phosphates in ATP’s tri-phosphate group is snapped off, removing one of the phosphates in the ATP molecule. The trio becomes a duo, thus turning ATP into ADP or adenosine di-phosphate⁽⁴⁾
This breakage releases immense energy, and our cells use the energy to power important cellular activities.
Our mitochondria work hard to make sure our cells have enough of these ready-to-use “batteries”, or ATP, floating around.
In order to create more ATP, our mitochondria go through a series of chemical reactions to break down our food, particularly glucose, amino acids, and fatty acids.
Glucose is really the primary molecule that our food is broken down into, so let’s focus on glucose to understand how our mitochondria convert food into energy.
Our mitochondria take our glucose molecules through a process called cellular respiration, which is essentially just a process of breaking down and converting glucose by combining oxygen with a glucose molecule. The oxygen is derived from the air we breathe.⁽⁵⁾
This process of adding oxygen to glucose produces a string of molecules. At its most rudimentary form, the process looks like the following formula:
Glucose + Oxygen = Carbon Dioxide, Water, and ATP.
Carbon Dioxide and water are byproducts of the process. This is cellular respiration, simplified.
Our mitochondria do not take glucose in its raw form. It’s not usable in its regular state, so our cells break glucose down even more before passing it to our mitochondria. This process is called glycolysis.⁽⁵⁾
The broken-down form of glucose is what is really combined with oxygen to produce a net of carbon dioxide, NADH, FADH2, and ATP. This process is what’s called the Krebs Cycle. Let’s break the products of this process down:
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Carbon Dioxide: One of our byproducts. You breathe this out.
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NADH and FADH2: Nicotinamide adenine dinucleotide (NAD+) and flavin adenine dinucleotide (FAD) are coenzymes that help generate more ATP. NADH and FADH2 are their electron-charged forms. Ignore this for now. We’ll talk about these important players later.
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ATP: Energy!
So, the Krebs Cycle creates energy, but the Krebs Cycle alone does not produce enough of the ATP our cells require. The real prizes are the NADH and FADH2 that are produced in the process. They are what really produce the majority of our ATP through what’s called the electron transport chain.⁽⁵⁾
The electron transport chain is essentially a process where our mitochondria constantly “steal” from its guests. NADH and FADH2 are electron-charged molecules, and our mitochondria “steal” these electrons from NADH and FADH2, turning them into NAD+ and FAD as a result.⁽⁵⁾
In turn, our mitochondria take these charged electrons and produce a ton of ATP, turning lemons into lemonade. This process is so efficient in producing ATP that the electron transport chain produces the majority of our ATP energy.
Fortunately, the mitochondria’s willing friends, NAD+ and FAD, continue to come back bearing gifts of charged electrons to sustain the process. It's a perfect supply chain, and the only byproduct in this process is water, thus completing our formula:
Glucose + Oxygen = Carbon Dioxide, Water, and ATP.
The role of mitochondria extends far beyond just producing energy. They're also involved in maintaining proper calcium levels in cells, generating heat, and controlling the natural process of cell death, known as apoptosis.⁽⁶⁾ This means that mitochondrial function affects everything from your brain power to muscle strength to metabolic health.
Think of mitochondria as tiny factories inside each cell. Raw materials (food) enter, and through a complex assembly line (cellular respiration), they're transformed into usable energy (ATP). Just like any factory, efficiency matters, and when the production line slows down, everything dependent on that energy is impacted.
Factors Impacting Mitochondrial Health
As we age, our mitochondria naturally become less efficient, which leads to a decrease in energy production. This decline in mitochondrial function is considered one of the hallmarks of aging.
Several factors can affect your mitochondrial health:
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Age-related decline: As we grow older, mitochondria become less efficient and fewer in number, which contributes to decreased energy levels and impaired cellular function.
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Diet and nutrition: Certain nutrients like B vitamins, magnesium, and antioxidants are essential for mitochondrial function, while processed foods and excess sugar can impair it.
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Physical activity: Regular exercise stimulates mitochondrial biogenesis, which is the process of creating new mitochondria, improving your cellular energy production capacity.
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Chronic stress: Prolonged stress releases cortisol, which can damage mitochondria and reduce their efficiency over time.
The connection between mitochondria and overall health is clear. Research has shown that mitochondrial dysfunction plays a role in many chronic conditions, including diabetes and neurodegenerative diseases like Alzheimer's and Parkinson's.⁽⁷,⁸⁾
What Are Signs of Mitochondrial Dysfunction?
When your mitochondria aren't functioning optimally, your whole body can feel the effects. There are a few common signs of mitochondrial dysfunction, which, if present, should be discussed with your healthcare provider. Potential signs may include:⁽⁹⁾
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Fatigue: Feeling unusually low on energy or more tired than usual, even after getting adequate rest. More than just feeling tired—an deep exhaustion that may not always improve with rest.
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Mental fatigueBrain fog: Because the brain has high energy demands, changes in mitochondrial function may contribute to feeling mentally tired or having difficulty staying focused. Difficulty focusing, memory problems, and mental clarity issues could signal that your brain cells aren't getting enough energy.
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Slow recovery: Muscles require a lot of cellular energy, especially during exercise. When mitochondrial function is impaired, muscles may fatigue more easily and take longer to recover. Your muscles have some of the highest energy demands in your body, so they're often the first to show signs of mitochondrial dysfunction.
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Digestive issues: Healthy digestion depends on cellular energy, which is why mitochondrial health may play a role in how well the digestive system functions. Digestive issues: The digestive tract requires a significant amount of energy to function properly, making it vulnerable to mitochondrial dysfunction.
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Temperature sensitivity: Difficulty regulating body temperature, especially in cold environments.
Research has consistently shown a strong connection between mitochondria and aging. As mitochondrial function decreases, cellular aging accelerates. This creates a vicious cycle where aging mitochondria produce more harmful free radicals, leading to further mitochondrial damage and accelerated aging.
Mitochondria and the Role of NAD+
As crucial as mitochondria are for creating energy, it’s not as simple as one organelle. A variety of chemical reactions and coenzymes are at play, notably one critical molecule known as nicotinamide adenine dinucleotide (NAD+).
As mentioned before, two coenzymes are created in cellular respiration: FAD and NAD+. However, between the two, we produce far more NAD+ than we do FAD.
If the mitochondria were factories, the NAD+ molecules would be the fleet of delivery trucks, and the FAD molecules would be the temp drivers who only work part-time.
NAD+ is like the mitochondria’s most reliable friend, constantly delivering charged electrons to produce bountiful ATP in the electron transport chain.
Unfortunately, the amount of NAD+ we produce naturally declines with age. This decline is considered a key factor in age-related mitochondrial dysfunction. Boosting NAD+ levels can help improve mitochondrial function and can support healthy aging by supporting cellular energy production.
Like the mitochondria, the number of NAD+ we have in our cells is also largely affected by our lifestyle and habits.
A study published in Physiological Reports shows that exercise training can naturally increase NAD+ levels.⁽¹⁰⁾
Conversely, other metabolic stressors such as immune stress, excessive alcohol consumption, and high fat, high sugar diets in conjunction with aging can contribute to NAD+ depletion.
In pursuit of understanding the science of aging and how to best manage it, the scientific community has put a large focus on NAD+ research and its relationship to mitochondrial dysfunction.
NAD+ is absolutely essential for mitochondrial function, serving as an electron carrier in the energy production process. It's involved in over 500 enzymatic reactions and plays a role in DNA repair, immune function, and cellular communication.
Luckily, maintaining healthy mitochondrial function is possible with a few lifestyle changes. Here are some tips on how to support mitochondrial health.
How to Boost Your Mitochondria Naturally
Supporting your mitochondria through lifestyle changes can help maintain energy levels and promote healthy aging:
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Prioritize nutrient-dense foods: Eat colorful vegetables, high-quality proteins, and healthy fats that provide the essential nutrients needed for mitochondrial function.
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Exercise regularly: Regular exercise stimulates mitochondrial biogenesis, increasing the number and efficiency of your mitochondria.
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Practice intermittent fasting: Time-restricted eating and other forms of intermittent fasting can trigger mitochondrial renewal processes.
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Manage stress effectively: Chronic stress can damage mitochondria, so incorporate stress-reduction techniques like meditation, yoga, or spending time in nature.
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Optimize sleep quality: During deep sleep, your body repairs and regenerates mitochondria, so prioritize good sleep hygiene.
Consider targeted supplements: Certain nutrients specifically support mitochondrial function, like NAD+ precursors. What are NAD+ supplements exactly? These are designed to increase NAD+ levels in the body, providing the raw materials your cells need to make more of this critical molecule.
How NAD+ Supplements Can Support Mitochondrial Health
Replenishing NAD+ levels offers multiple benefits that directly impact your daily life and long-term health. By supporting optimal NAD+ levels, you can experience:
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Supports cellular energy boost: NAD+ helps your mitochondria convert food into energy efficiently, providing sustained vitality without the crash associated with stimulants or sugar.
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Supports metabolic health: NAD+ supports a healthy metabolism, helping maintain optimal function of over 500 different biochemical processes in cells.
- Cellular protection and repair: NAD+ activates sirtuins, proteins that help protect cells from stress and support DNA repair mechanisms, potentially slowing aspects of cellular aging.⁽¹¹⁾
Support for muscle recovery: By enhancing mitochondrial function in muscle tissue, adequate NAD+ levels can support muscle recovery.
NAD+ supplementation is one of the most promising approaches to supporting mitochondrial health as we age. Because NAD+ doesn't work effectively when taken directly, scientists have developed precursors, which are compounds that the body can convert into NAD+.
Nicotinamide riboside (NR) is one such precursor that has shown particular promise in NAD+ research studies. NR efficiently converts to NAD+ in the body, helping to restore levels that decline with age and metabolic stressors.
Tru Niagen offers a patented form of NR called Niagen®, which has been clinically studied to increase NAD+ levels. By boosting NAD+ in your cells, Niagen helps support mitochondrial function and cellular energy production. This can translate to support for cellular energy, metabolic health, and healthy aging.
It’s essential to understand that not all NAD+ boosters are high-quality supplements, as some feature misleading labels that fail to meet their advertised NR content. Unlike some other NAD+ precursors, Niagen has 45+ human clinical studies that show safety and efficacy, making it a reliable choice for those looking to support their mitochondrial health.
Understanding Mitochondria: Why Mitochondrial Health Is the Key to Aging Well
Your mitochondria are the foundation of your energy, vitality, and longevity. By understanding how these tiny powerhouses function and what they need to thrive, you can take proactive steps to support them throughout your life.
As research continues to illuminate the critical role of mitochondria in health and aging, it becomes increasingly clear that taking care of these essential cellular structures is one of the most important things we can do for long-term wellness. Whether through lifestyle optimization or targeted supplementation with products like Tru Niagen, supporting your mitochondrial health is an investment in your body's energy production system and your future well-being.