Oxidative stress: causes, symptoms and how to reduce it

Oxidation processes occur in the body every day – it is a natural part of many biological reactions. During these processes, free radicals are formed, the amount of which the body regulates by utilizing antioxidant defense mechanisms.

Oxidative stress occurs when the balance between free radical formation and the body's ability to neutralize them is disrupted. Scientific studies link oxidative stress to various cellular changes, making it widely studied in the context of aging processes and various health conditions.

In this article, you will learn what oxidative stress is, its causes, what symptoms may be associated with it, and what daily habits are important for maintaining the body's balance.

Oxidative stress is a condition where the balance between the formation of free radicals and the body's ability to neutralize them through antioxidant defense is disrupted. When free radicals are produced in excess of what the body can manage, they can contribute to oxidative damage to cellular components – lipids, proteins, and DNA.

To better understand why oxidative stress occurs, it is first worth explaining what free radicals are.

Free radicals are unstable molecules with an unpaired electron. This property makes them highly reactive and capable of interacting with other molecules in the body, and in excess, contributing to oxidative damage.

One of the most important groups of free radicals is reactive oxygen species (ROS), which are naturally formed during various biological processes, such as energy production in mitochondria or the body's response to certain environmental factors.

The body has an antioxidant defense system that helps regulate the amount of reactive molecules. When this balance is disrupted and more free radicals are formed than the body can neutralize, oxidative stress develops.

Although free radicals are often viewed negatively, their role in the body depends on the amount and context. Studies show that reactive oxygen species (ROS) are involved in cell signaling, immune system activity, and other important biological processes. For example, immune system cells can use reactive oxygen species as one of their defense mechanisms against microorganisms.

ROS also participate in processes that help the body adapt to various changes, such as physical exertion. Therefore, the most important thing for the body is the balance between free radical formation and antioxidant defense, rather than the complete elimination of reactive molecules.

Oxidative stress is usually not associated with a single specific factor – it can be caused by a combination of various internal and external factors. Studies link the development of oxidative stress to both processes occurring in the body and to an individual's environment and lifestyle.

Below are the main factors that can contribute to increased free radical formation or changes in the body's antioxidant defense.

Daily habits can influence the balance of oxidative processes in the body. The most commonly mentioned include:

• smoking

• excessive alcohol consumption

• chronic stress

• sleep deprivation

• low physical activity

The impact of these factors usually depends on their duration and intensity. For example, short-term stress is a normal body reaction, but prolonged stress can contribute to more significant changes in oxidative balance.

The formation of free radicals can also be stimulated by certain environmental factors, such as:

• ultraviolet (UV) radiation

• air pollution

• certain chemical compounds

It is impossible to completely avoid environmental impact, but its significance also depends on intensity and duration. The body constantly adapts to environmental changes, but long-term greater exposure to external factors can increase the need for antioxidant protection.

Increased oxidative stress is also frequently studied in the context of various health conditions, including:

• obesity

• metabolic syndrome

• diabetes

• chronic inflammatory processes

It is important to emphasize that in these cases, oxidative stress is usually only a part of complex biological processes. It can be associated with inflammatory processes, metabolic changes, and other mechanisms occurring in the body.

Oxidative stress does not have specific symptoms that would allow this condition to be precisely identified. Unlike many other health problems, it is usually assessed based on biological processes and certain markers of oxidative stress, rather than on one or more clear signs.

For this reason, the effects of oxidative stress are usually evaluated within a broader context of bodily processes. Studies examine its connection to inflammatory processes, cell damage, tissue changes, and the body's response to various internal and external factors.

Some signs that may be associated with increased oxidative processes include:

• more frequent or prolonged fatigue

• slower recovery after physical exertion

• more frequent inflammatory processes

• faster signs of skin aging

• reduced physical performance

It is important to understand that these signs are not exclusive to oxidative stress. They can arise from many other causes, such as lack of sleep, chronic stress, dietary changes, or various health conditions. Therefore, oxidative stress cannot be determined based solely on how one feels.

Assessing oxidative stress is more complex than many conventional health indicators, as there is no single universal test that accurately shows the overall picture of oxidative processes. This is because oxidative processes occur in different parts of the body and can involve various molecules – lipids, proteins, or DNA.

Scientific studies use various biological markers (biomarkers) to evaluate oxidative stress, which help to assess different processes of oxidative damage. However, scientific reviews note that the application of these indicators in daily clinical practice is still limited.

The following indicators are most commonly assessed in scientific studies:

• MDA (malondialdehyde), associated with lipid oxidation

• F2-isoprostanes – among the most commonly used markers of lipid oxidation

• oxidized LDL cholesterol

• indicators of the glutathione system

While these markers provide valuable information in the context of research, their evaluation depends heavily on the chosen method, the process being studied, and other factors. For this reason, oxidative stress tests are not considered a routine part of general health assessment.

Completely avoiding oxidative processes is impossible and unnecessary – they are a natural part of the body's activity. However, certain daily habits can help maintain a balance between free radical formation and the body's antioxidant defense.

Reducing oxidative stress is usually associated not with a single measure, but with a general lifestyle – a combination of diet, rest, physical activity, and other daily habits.

Diet is one of the factors that can contribute to the body's antioxidant defense. Antioxidants and other biologically active compounds are abundant in various foods, especially fruits, vegetables, berries, nuts, seeds, and high-quality vegetable oils, such as extra virgin olive oil.

It is important to note that the greatest benefits are associated not with one specific substance or product, but with overall long-term dietary habits. If needed, antioxidant supplements can also be used alongside a balanced diet.

To learn more about the main antioxidants, how they differ, which foods contain them, and what to know about antioxidant supplements, read the detailed article on antioxidants.

Quality sleep is essential for many of the body's recovery processes. Lack of sleep can affect hormone regulation, immune system function, and inflammatory processes, which are important for maintaining the body's normal balance.

Scientific reviews examine that insufficient or disrupted sleep can be associated with changes in oxidative stress markers and the body's antioxidant defense.

Long-term psychological stress can also influence the body's physiological processes. During stress, various body systems are activated, including hormonal responses. Studies investigate how chronic stress can be associated with the formation of reactive oxygen species, inflammatory processes, and changes in oxidative balance.

Managing chronic stress does not mean completely eliminating stress – short-term stress responses are a normal part of the body. More attention should be paid to chronic, long-term stress and sufficient recovery.

This can be helped by:

• sufficient sleep duration

• regular rest

• relaxation techniques

• maintaining a work-life balance

We also invite you to read a detailed article on quick stress reduction methods.

Regarding physical activity, it is worth mentioning an interesting adaptation mechanism of the body. During more intense physical exertion, the production of reactive oxygen species temporarily increases, so oxidative processes can intensify in the short term. However, this is not necessarily considered a negative phenomenon. Regularly repeated physical exertion stimulates the body's adaptation – this phenomenon is called hormesis. Thus, small and controlled stress can promote positive changes in the body's protective systems.

This phenomenon is also examined in scientific studies – they describe that reactive oxygen species formed during physical activity can act as signaling molecules involved in the body's response to physical exertion.

Of course, one should not forget the proper balance of physical activity. Very intense exertion without sufficient rest can become an additional stress for the body, so it is important to combine regular movement with sufficient recovery.

REMINDER: WHAT TO KNOW ABOUT OXIDATIVE STRESS?

Oxidative stress is a part of natural processes occurring in the body, but the most important aspect is the balance between the formation of free radicals and antioxidant defense. Free radicals also perform important functions in the body, so the goal is not to completely avoid them. Much more significant are factors that help maintain normal bodily processes: a varied diet, sufficient rest, a proper balance of physical activity, and other long-term lifestyle habits. Oxidative stress should be viewed as part of the body's overall balance, not as a single isolated process.