article_snippet.sent: This is because your body is under oxidative stress - a process that can also happen after smoking, breathing in pollution and even sunbathing.
article_snippet.sent: Your body constantly reacts with oxygen as you breathe and your cells produce energy.
article_snippet.sent: As a consequence of this activity, highly reactive molecules are produced known as free radicals.
article_snippet.sent: Free radicals interact with other molecules within cells.
article_snippet.sent: External factors, such as pollution, sunlight and smoking, also trigger the production of free radicals.