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Emilia Klapp, Nutrition & Dietetics, answeredMany health problems stem from the effect of oxygen on the body. Oxygen, although indispensable for life, is destructive to the cells. The attacks of free radicals, or unstable molecules, subject our cells to continuous damage, known as oxidative stress or oxidation. This process makes us age, converts healthy cells into cancerous ones, elevates the blood pressure, hardens the arteries, promotes inflammation in arthritis and asthma, and causes infertility. Nutrients called antioxidants help the body’s natural defense system combat the oxidation process.