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E-Mail IMAGE: Unhealthy lifestyles, various diseases, stress, and aging can all contribute to an imbalance between the production of ROS and the body s ability to reduce and eliminate them. The resulting excessive. view more Credit: National Institutes for Quantum and Radiological Science and Technology. Oxygen is essential for human life, but within the body, certain biological environmental conditions can transform oxygen into aggressively reactive molecules called reactive oxygen species (ROS), which can damage DNA, RNA, and proteins. Normally, the body relies on molecules called antioxidants to convert ROS into less dangerous chemical species through a process called reduction. But unhealthy lifestyles, various diseases, stress, and aging can all contribute to an imbalance between the production of ROS and the body s ability to reduce and eliminate them. The resulting excessive levels of ROS cause oxidative stress, which can disrupt normal cellula ....