Oxidative stress is what happens when our cells are attacked by free radicals. In excess, these unstable molecules overwhelm our defenses, damaging the body. Here we take a look at their sources and consequences, and the ways in which we can help keep them under control.
Cells are the site of one of the body’srespiration processes: oxygen is used by cells to ensure they, and the body as a whole, function properly. This cellular respiration occurs in the mitochondria, the cells’ powerhouses.
When mitochondria use oxygen in cellular respiration, changes occur in the surrounding molecules. They lose an electron, and as a result, become unstable molecules called free radicals.
These unpaired electrons frantically try to restore their stability by stealing an electron from a neighbouring molecule, which in turn tries to do the same. This quickly results in a chain reaction as the body finds itself unable to withstand this multitude of unstable particles. (1)
It’s when free radicals are generated by external factors that the body becomes overwhelmed. And there are many such factors:
These factors are responsible for excessive circulation of energy in cells which causes, or accelerates, the production of free radicals. The excesses of modern lifestyles are thus often cited as a cause of oxidative stress (2).
Oxidative stress is involved in a number of mechanisms that are damaging to health. As mentioned, free radicals try to restore their stability by attacking and stealing electrons from surrounding molecules.
These attacks result in a widespread cascade of denaturation - of DNA, proteins and lipids: tissues become damaged and no longer function properly. Chain reactions therefore lead to defective functioning of the body in general. For that reason, oxidative stress is recognized as one of the primary mechanisms of aging (3).
While we may be more aware of the visible effects, such as damage to the health and elasticity of our skin, free radicals also produce unseen consequences within the body which may worsen. The nervous system is one such example, with deteriorations in neurodegenerative diseases such as Alzheimer’s and Parkinson’s disease. (4)
The cardiovascular system is also a victim: in excess, free radicals affect the arteries, veins, heart … Oxidative stress causes structural and functional damage and can lead to atherosclerosis and coronary artery disease … (5)
Most of the time, free radicals are discussed in terms of the damage they do to the body. However, it’s important to understand that they are also necessary for the immune system. This has been observed in the case of viral infections in particular (6). Free radicals also help speed up the healing of wounds … (7). A paradox that’s often overlooked!
The body is naturally equipped with an antioxidant function. Certain compounds are able to neutralize free radicals and restrict the chain reaction. Glutathione, enzymes such as peroxidase, catalase and superoxide dismutase, as well as vitamins C and E are all antioxidants naturally present in the body.
To help combat oxidative stress, there are several simple habits you can adopt. Give up smoking, and reduce your alcohol consumption and exposure to the sun as much as possible.
In addition, eat a balanced diet high in antioxidants. For this, you need to prioritise fruits and vegetables in general, as well as aromatic herbs and spices , ‘good’ fats (avocados, dried fruit, vegetable oils, oily fish…), and algae… Limit your intake of animal fats (meat, charcuterie, dairy foods) and products with added sugar. These are the principles of an antioxidant diet.
Concentrated dietary supplements can also provide the body with significant antioxidant power. Polyphenols, glutathione, carnosine, ergothioneine... Many molecules naturally present in the body can be boosted through supplementation to give you extra ammunition in the fight against free radicals!
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