Free Radicals

What are Free Radicals?

Free radicals are unstable molecules that have an unpaired electron. These molecules can arise naturally in the body as a byproduct of metabolism or through external factors such as pollution, UV radiation, and tobacco smoke. Because free radicals are unstable, they seek stability by reacting with other molecules, which can lead to damage to cells, DNA, and proteins.

How do they work in the body?

In the body, free radicals can cause oxidative stress, which is a condition where there is an imbalance between the production of free radicals and the body's ability to counteract their harmful effects. Oxidative stress has been linked to several diseases, including cancer, cardiovascular diseases, and neurodegenerative disorders. The body has natural defence mechanisms, such as antioxidants, that help neutralise free radicals and protect cells.

Scientific benefits

Several studies have shown that antioxidants, such as vitamin C, vitamin E, and polyphenols, can help counteract the effects of free radicals. According to a study published in the journal Nature, increased antioxidant intake can reduce the risk of chronic diseases by combating oxidative stress. Another study in The Journal of Nutrition showed that a diet rich in antioxidants can help improve heart health and reduce inflammation.

Dosage and recommendations

There is no specific recommended dosage of antioxidants, but it is advised to consume a varied diet rich in fruits, vegetables, and whole grain products. It is important to note that higher doses of supplements in some cases can have adverse effects, so it is best to consult a doctor or dietitian before starting supplements.

Best sources and forms

There are many natural sources of antioxidants that can help neutralise free radicals:

• Fruits such as berries, oranges, and kiwi
• Vegetables such as spinach, broccoli, and carrots
• Nuts and seeds
• Spices such as ginger and turmeric

There are also supplements containing specific antioxidants, such as vitamin C, vitamin E, selenium, and beta-carotene, but these should be used with caution.

Side effects and warnings

Although antioxidants are important for health, excessive consumption of supplements can lead to negative side effects. High doses of vitamin E have been linked to an increased risk of bleeding, and some studies have suggested that high doses of beta-carotene may increase the risk of lung cancer in smokers. It is always best to obtain antioxidants from a balanced diet rather than supplements.

Frequently asked questions

What causes free radicals?

Free radicals are naturally formed during the body's metabolism, but they can also be caused by external factors such as pollution, UV light, smoking, and stress.

Can I completely avoid free radicals?

It is impossible to completely avoid free radicals, as they are a natural part of the body's biochemistry. The most important thing is to support the body's defence by eating a nutritious diet and living a healthy lifestyle.

Are all free radicals harmful?

Not all free radicals are harmful. Some play an important role in the immune system and help fight infections. The problem arises when there is an overproduction of these molecules leading to oxidative stress.

Which foods are best to combat free radicals?

Foods rich in antioxidants, such as colourful fruits and vegetables, nuts, seeds, and whole grain products, are the best for combating free radicals.