Oxidative Stress

What is Oxidative Stress?

Oxidative stress is an imbalance between free radicals and antioxidants in the body. Free radicals are unstable molecules that can cause cellular damage, while antioxidants are substances that protect cells by neutralising these harmful molecules. When the body produces more free radicals than the antioxidants can manage, oxidative stress occurs. This phenomenon has been linked to ageing and several chronic diseases, including cardiovascular diseases, cancer, and neurodegenerative disorders.

How does it work in the body?

Oxidative stress arises as a natural part of the body's metabolism, but it can also be triggered by external factors such as environmental pollution, tobacco smoke, radiation, and certain chemicals. Free radicals are formed when oxygen is metabolised, and they can attack cell components such as DNA, lipids, and proteins, leading to cellular damage and dysfunction. Antioxidants, such as vitamin C, vitamin E, and glutathione, play a crucial role in neutralising these free radicals and protecting the body from harm.

Scientific benefits

Many studies have investigated the relationship between oxidative stress and health-related conditions. Here are some key findings:

• Heart diseases: Research shows that oxidative stress can contribute to the development of atherosclerosis, a disease where plaque builds up in the arteries, increasing the risk of heart attacks.
• Cancer: Oxidative stress has been linked to DNA damage that can lead to cancer development. A study published in Nature showed that antioxidant treatments can reduce the risk of certain types of cancer.
• Neurodegenerative diseases: Research has shown that oxidative stress plays a role in the development of diseases such as Alzheimer's and Parkinson's. Antioxidants have been shown to have a protective effect on brain cells.

Dosage and recommendations

There is no universal recommendation for antioxidant dosage, as the need may vary depending on individual factors such as diet, lifestyle, and health status. Generally, it is recommended to obtain antioxidants through a balanced diet that includes a variety of fruits and vegetables. If you are considering taking supplements, you should consult a healthcare provider to determine the appropriate dosage.

Best sources and forms

Antioxidants are found in a wide range of foods, and the most effective sources include:

• Fruits: Berries (blueberries, raspberries), citrus fruits (oranges, lemon juice), and apples.
• Vegetables: Spinach, kale, broccoli, and red peppers.
• Nuts and seeds: Walnuts, almonds, and sunflower seeds.
• Spices: Turmeric and ginger have also been shown to have antioxidant properties.

Side effects and warnings

Although antioxidants are important for health, excessive consumption of supplements can lead to adverse effects. High doses of certain antioxidants, such as vitamin E, may increase the risk of bleeding and other health problems. Therefore, it is important to adhere to recommended doses and always consult a doctor before starting new supplements.

Frequently Asked Questions

What is the difference between free radicals and antioxidants?

Free radicals are unstable molecules that can cause cellular damage, while antioxidants are substances that protect cells by neutralising these harmful molecules.

Can I get enough antioxidants through diet?

Yes, a balanced diet rich in fruits and vegetables can provide sufficient amounts of antioxidants for most people.

What symptoms may indicate oxidative stress?

Symptoms of oxidative stress can include fatigue, muscle weakness, and an increased susceptibility to illnesses. It is important to consult a doctor for proper diagnosis and treatment.

Is oxidative stress linked to ageing?

Yes, oxidative stress has been linked to ageing and may contribute to the development of age-related diseases.

Can I take antioxidants as supplements?

Yes, but it is important to consult a doctor before starting supplements, especially if you have underlying health conditions.