MITO-dictionary

Mitochondria — these are tiny structures inside cells that help us get energy from food and oxygen.
They are often called the "power plants" of the cell because it is in the mitochondria that a significant portion of ATP is formed — the molecule that provides energy for most cellular processes.
But the role of mitochondria isn't limited to just energy production. They participate in metabolism, regulation of oxidative stress, cellular adaptation to stress, cell renewal, and the functioning of the immune system.
Mitochondrial function is influenced by nutrition, physical activity, sleep quality, stress levels, age, inflammatory processes, and exposure to adverse environmental factors. That's why taking care of your mitochondria is part of a holistic approach to maintaining energy, recovery, and the normal functioning of your body.

You can think of mitochondria as the cell's "mini-power stations." They take the nutrients we get from food and oxygen to convert them into the energy needed for the cell's life.
The process can be compared to a furnace: without fuel or oxygen, no energy is released. In mitochondria, the "fuel" consists of carbohydrates, fats, and proteins, while oxygen is needed to oxidize these substances.
The main product of mitochondrial work is ATP (adenosine triphosphate). This is a molecule that supplies energy for most biochemical reactions in the cell: movement, protein synthesis, cell division, and much more.
Part of the energy is also released in the form of heat, which helps maintain a stable body temperature in warm-blooded animals, including humans.

Mitochondrial health — this is the health of all mitochondria in the body, which ensure the efficient activity of every cell in all organs and systems of the human body.
When mitochondria work less efficiently, tissues with high energy demands—the brain, heart, muscles, and immune system—suffer the most. This can affect your energy levels, endurance, and overall well-being, although fatigue isn't always linked solely to mitochondria.

You can support normal mitochondrial function in several ways.
The first and most basic way is lifestyle. Regular physical activity, a balanced diet, sufficient sleep, recovery, stress levels, and overall metabolic health all influence the state of your mitochondria.
The second way — providing the body with substances involved in energy metabolism. These include proteins, healthy fats, B vitamins, magnesium, iron, zinc, coenzyme Q10, and other nutrients. They don't "turn on" mitochondria directly, but they help support processes related to energy production, enzyme function, and protecting cells from oxidative stress.
The third way no longer refers to everyday health support, but to the field of modern biomedicine. We are talking about gene therapy methods and mitochondrial DNA editing, which are being studied to treat rare hereditary mitochondrial diseases. This is a complex medical field that is not used as a standard way to improve mitochondrial health in healthy people.
Therefore, in everyday life, the foundation of mitochondrial support remains lifestyle, nutrition, movement, sleep, and recovery.

Immunity needs energy and fast internal communication between cells. Mitochondria play a major role in this. They help immune cells switch into action, trigger antiviral and antimicrobial mechanisms, regulate inflammation, and support the production of cytokines — special signaling molecules that immune cells use to "talk" to each other and coordinate the body's defensive response. That is why healthy mitochondrial function is vital for the immune system to act harmoniously and on time.

The first changes in how you feel can appear after a few weeks of regular habits.
A more sustainable effect usually takes several months to form.
The speed of changes is influenced by:

• physical activity;
• nutrition;
• sleep;
• recovery;
• stress levels;
• age and health status.

There is no universal timeframe. The main things are consistency, gradual progress, and a long-term lifestyle.

Some mitochondrial dysfunctions can indeed be passed from mother to children. This applies to primary mitochondrial diseases - rare genetic disorders where mitochondria in cells do not function correctly from birth.
It is important to understand that not all mitochondrial problems are inherited. Most dysfunctions are related to lifestyle, nutrition, stress, and age-related changes, and such "secondary" problems are not directly inherited.

One of the simplest ways to check how well your mitochondria are working is the "breath test": time how long you can hold your breath after a deep inhale. If the result is less than 60 seconds, it means your mitochondria aren't working at full strength and you need to take care of their health.

There isn't a single test that definitively shows "poor mitochondrial function."
Mitochondrial function can be indirectly assessed by:

• lactate;
• pyruvate;
• lactate/pyruvate ratio;
• amino acids;
• acylcarnitines;
• urinary organic acids;
• CPK and certain other indicators;
• genetic testing when hereditary mitochondrial diseases are suspected.

"Oxidative stress" and "antioxidant status" panels can be additional, but not direct, mitochondrial tests.

There is no single direct test "for mitochondrial quality."
Energy metabolism can be indirectly assessed through:

• cardiopulmonary exercise testing, CPET;
• measurement of oxygen consumption VO₂;
• assessment of CO₂ production;
• anaerobic threshold;
• exercise tolerance;
• sometimes — lactate before and after exercise.

A standard treadmill test usually evaluates heart function and is not a specific test for mitochondria.
If mitochondrial diseases are suspected, diagnostics are always comprehensive.

Mitochondria need a diet that helps cells get energy without constant overload.
To maintain mitochondrial health, you need to:
1. Minimize simple carbohydrates in your diet;
2. Eliminate snacking. There should be 2–3 meals per day;
3. Eat only after you feel real hunger;
4. Change your attitude toward mild hunger and accept that it's normal.
The main goal isn't to starve, but to build a diet where your body has enough energy and your sugar and insulin levels don't spike all day.

For mitochondria to function normally, foods that help maintain stable energy metabolism and don't create sudden overloads for the body are important.
Healthy fats are of particular importance, for example: fatty fish, eggs, avocado, olive oil, nuts, and seeds. Fatty acids can be used by mitochondria as a high-quality energy source, especially when reducing the amount of fast carbohydrates in your diet.
At the same time, mitochondrial health doesn't depend on just one product, but on your overall lifestyle: a balanced diet, enough protein, healthy fats, vitamins and minerals, regular movement, sleep, and recovery.

Modern research shows that mitochondrial dysfunction — meaning disruptions in how mitochondria work — can contribute to the development of several chronic diseases, such as diabetes, atherosclerosis, neurodegenerative diseases (Alzheimer's and Parkinson's), and some forms of cancer.
Mitochondria are involved in energy production, regulation of oxidative stress, inflammatory processes, and cellular metabolism. Disruptions in these functions can increase cell vulnerability to damage and create conditions for the development of pathologies. But it's important to understand that mitochondria are just one of the factors. Diseases develop due to a complex interaction of genetics, lifestyle, nutrition, inflammation, and other factors. At the same time, supporting your mitochondria helps cells work more efficiently, which reduces the load on the body and increases overall energy levels. (Endocrine Reviews, 2020 — Mitochondria and Non-Communicable Chronic Diseases, PMC, 2022 — Role of Mitochondrial Dysfunction in Neurodegenerative Diseases, Springer, 2019 — Mitochondrial metabolism in aging and cancer.)

Mitochondria are organelles in cells that originated from ancient bacteria that lived independently about 2 billion years ago. In the course of evolution, some of these bacteria entered into symbiosis with an ancestral eukaryotic cell — that is, they began to live inside it and perform functions useful for both parties.
This process led to the emergence of the eukaryotic cell — a cell with a nucleus and mitochondria — which became the basis for all complex life on Earth: plants, animals, and humans.
Thus, mitochondria have retained some of their bacterial characteristics, but now function as an integral part of our cells, providing them with energy and participating in vital cellular processes.

Mitochondria are living structures inside cells that are constantly being renewed. The lifespan of mitochondria depends on the type and activity of the cell they are in:

• in rapidly dividing cells (for example, the intestinal epithelium), mitochondria are renewed every few days;
• in more stable cells (for example, muscles or neurons), they can work for months.

Old or damaged mitochondria are destroyed, and new ones are formed through the process of mitochondrial biogenesis, ensuring constant renewal and maintenance of cellular energy.

In most cells of the body, mitochondria are constantly being renewed. This doesn't happen on a strict schedule: mitochondria don't have a single lifespan that is the same for all tissues. The rate of their renewal depends on the cell type, activity level, age, nutrition, sleep, stress, and the overall state of your body.
New mitochondria appear thanks to a process called mitochondrial biogenesis. This is when a cell creates new mitochondrial components, increases the number of mitochondria, and maintains their function in accordance with its energy needs.

Old and damaged mitochondria are removed through mitophagy — a process of cellular recycling.
Before this, the cell assesses the state of the mitochondria through a mitochondrial quality control system: fusion, fission, and other processes of mitochondrial dynamics.
If a mitochondrion is working poorly, the cell sends it for recycling. It is broken down into components, some of which can be reused to renew cellular structures and maintain energy metabolism.

Mitochondria get energy from nutrients and oxygen.
Oxygen is needed for oxidative metabolism — the process in which nutrients are converted into energy.
Main fuel sources:

• Carbohydrates — for example, glucose.
• Fats — fatty acids from food or the body's fat stores.
• Proteins — amino acids can be partially used in energy metabolism.

Mitochondria convert these substances into ATP — universal energy for cells, while part of the energy is released as heat, maintaining body temperature.

The number of mitochondria in a cell depends on its functions and energy needs:

Egg cells: tens of thousands of mitochondria.
Neurons: up to 10,000 mitochondria in a single neuron.
Heart cells: 5,000–6,000 mitochondria.
Cells of the muscles, liver, kidneys, spleen, and pancreas: 2,000–4,000 mitochondria.
Red blood cells: do not contain mitochondria.

The fewest mitochondria are found in mature red blood cells — they don't have any at all. These cells carry oxygen, and during the maturation process, they get rid of their mitochondria and nucleus to make more room for hemoglobin.
If we're talking about cells that actually do have mitochondria, then sperm cells are one example. They usually have a few dozen mitochondria. These are located in the midpiece of the sperm and help provide energy for its movement.

Animals have mitochondria: they are found in most cells and help them obtain energy. The exception is certain specialized cells, such as mature mammalian red blood cells, which do not have mitochondria.

Yes, mitochondria are present in plant cells. They produce ATP — energy for growth and vital functions. Together with chloroplasts, mitochondria support all plant cell processes.

The Krebs cycle — is one of the key stages of cellular respiration. In it, the breakdown products of glucose, fatty acids, and some amino acids are converted into carbon dioxide, and the released energy is transferred to special molecules — NADH and FADH₂.
Then these molecules are directed to the mitochondrial respiratory chain, where, with the participation of oxygen, the main part of ATP is formed — the universal energy for cell function.
In other words, the Krebs cycle doesn't work in isolation: it links the breakdown of nutrients with the production of cellular energy.

Cellular respiration is a complex of biochemical reactions that allow the creation of a huge number of ATP molecules from glucose or fatty acids using oxygen, with the simultaneous release of water and carbon dioxide. Five enzymes participate in the work of cellular respiration on the inner membrane of each mitochondrion.
Cellular respiration is the process by which cells get energy from nutrients.

• Food (glucose, fatty acids, and partially amino acids) is gradually broken down within the cell.
• In the mitochondria, the breakdown products go through the Krebs cycle, where carbon dioxide is formed.
• Electrons released during the oxidation process are transferred along the respiratory chain on the inner mitochondrial membrane, where oxygen is converted into water, and energy is used for the synthesis of ATP — the cell's universal "energy currency."

Thus, cellular respiration links the breakdown of nutrients with the production of ATP, water, and carbon dioxide, providing cells with energy for all biochemical processes.

Carbon dioxide is formed in cells, primarily within the mitochondria, after the breakdown of glucose and fatty acids and their passage through the Krebs cycle. As a result of these reactions, carbon dioxide (CO₂) is produced. It then moves from the cells into the blood, is transported to the lungs, and is removed from the body when you exhale.

It's not just one specific product that's bad for mitochondria, but rather a diet with an excess of added sugar, fast carbs, ultra-processed foods, trans fats, and extra calories. This kind of nutritional overload can increase oxidative stress and inflammation, and disrupt the energy metabolism of your cells.

All people on planet Earth have always received and will always receive mitochondria only from their mother. This is exactly why in science there is such a concept as the mitochondrial first mother or Mitochondrial Eve.

Fats are one of the energy sources for mitochondria. They can use fatty acids as fuel, especially when they need more stable and long-lasting energy support.
But it's important to understand: fats don't always automatically "improve immunity." It all depends on their quality and quantity. Healthy fats from fish, eggs, olive oil, avocado, nuts, and seeds can be part of a diet that supports normal metabolism. Conversely, an excess of heavy, fatty, and ultra-processed foods can increase inflammation and put a strain on your cells.

Problems don't start with carbohydrates themselves, but from their constant excess: large amounts of sweets, frequent snacking, blood sugar spikes, and insulin resistance.
In such a situation, cells receive too much "fast energy," and it becomes harder for mitochondria to work stably.
This can increase oxidative stress, support inflammation, and disrupt the function of immune cells. Therefore, what matters for your immunity is not a total rejection of carbohydrates, but balance: fewer fast sugars, more whole foods, protein, healthy fats, fiber, and a stable eating schedule.

Excess fatty tissue can put a strain on cells and mitochondria. Free fatty acids, inflammation, and oxidative stress can reduce mitochondrial efficiency and disrupt energy production.
It's important to emphasize: the degree to which excess weight affects mitochondrial health depends on individual factors such as lifestyle, diet, physical activity, genetics, and metabolic state.

Regular workouts help mitochondria work more efficiently and form new mitochondria, especially in the muscles, heart, and liver.
Aerobic exercise, long-duration training, and high-intensity interval sessions activate PGC-1α, AMPK, and SIRT1 molecules, which are responsible for mitochondrial growth and function.
This helps cells get more energy, increases endurance, and improves metabolism.

You don't necessarily need to train for 1.5 hours every day. The main thing is regularity.
A good guideline: 30–60 minutes of moderate activity 5 times a week. This could be brisk walking, swimming, cycling, light jogging, or any other activity where your breathing becomes more active but you can still talk.
If you're just starting out, you can begin with 10–15 minutes a day and gradually increase the time. Even small but regular activity is better than rare, heavy workouts.
For the best effect, it's useful to combine aerobic exercise with strength training 2 times a week and don't forget about recovery.

As we age, mitochondria in many tissues can work less efficiently: they produce energy less effectively, renew themselves more slowly, and accumulate damage.
But this process isn't the same for everyone. Mitochondrial health is influenced by movement, nutrition, sleep, stress, inflammation, and chronic diseases.
Age is important, but your lifestyle helps keep your mitochondria working longer.

Mitochondria are hindered by everything that creates constant overload for the cells: lack of sleep, chronic stress, smoking, excessive alcohol, a sedentary lifestyle, constant sitting, overeating, and frequent sugary snacks.
A combination of factors has an especially strong impact: not enough movement, too many fast carbs, lack of sleep, and lots of stress. In this situation, it's harder for your cells to produce energy, cope with oxidative stress, and renew damaged mitochondria in time.
This can create a vicious cycle: less energy means you don't feel like moving, and less movement means your mitochondria get less stimulus to renew. That's why supporting your mitochondria starts with the basics: sleep, movement, nutrition, recovery, and giving up bad habits.

To maintain normal mitochondrial function, it's important to sleep regularly and for a sufficient amount of time. For adults, the optimal sleep duration is usually 7–9 hours per day.
Sleep helps cells recover, reduces oxidative stress, and supports efficient energy metabolism. Short sleep or chronic sleep deprivation can disrupt these processes, and excessively long sleep is also sometimes linked to metabolic changes.
The main thing is sleep regularity, quality, and following a routine, that matches your internal circadian rhythms.

The optimal guideline for the bedroom is: 16–20 °C.
In a cool room, it's easier for your body to switch into sleep mode: your internal temperature drops, your nervous system relaxes, and your sleep becomes deeper and better quality.
And good sleep is vital for cell recovery and the normal functioning of mitochondria — our "power plants."
But the temperature shouldn't be extremely low. The main thing is that it's cool, calm, and comfortable.

Short-term stress isn't harmful on its own: it helps your body quickly pull itself together and activate extra resources.
But if stress lasts for weeks and months, your body lives in a constant state of tension. The load on your nervous and hormonal systems increases, and levels of cortisol, adrenaline, and norepinephrine change.
In such conditions, it's harder for mitochondria to work stably. Oxidative stress can intensify, cell recovery can be disrupted, and energy production efficiency can drop.
This is most noticeable in tissues that need a lot of energy: your brain, heart, muscles, and immune system. That's why chronic stress is often linked to fatigue, a decrease in resources, sleep disturbances, and the feeling that you have less energy.

Short and moderate stresses, such as ice baths, saunas, infrared panels, or intermittent fasting, can stimulate mitochondria and improve their performance.
Mechanism: brief stress triggers adaptive signals that help cells create new mitochondria, strengthen antioxidant defenses, and increase the body's resilience.
The effect is only safe with controlled loads and if there are no health contraindications.

Short-term exposure to cold or heat can trigger the body's adaptive reactions.
Mitochondria are involved in these processes because they help cells produce energy and heat.
What can be useful:

• contrast showers;
• cool water pouring;
• bath or sauna if well tolerated;
• gradual adaptation to the cold.

Important: the effect depends on the dose. Too frequent, sudden, or extreme exposure can be harmful.