Oxidative stress is caused by an imbalance between the production of reactive oxygen and the detoxification of reactive intermediates. Reactive intermediates such as peroxides and free radicals can be very damaging to many parts of cells such as proteins, lipids and DNA. Severe oxidative stress can trigger apoptosis and necrosis. Oxidative stress is involved in many diseases such as atherosclerosis, Parkinson's disease and Alzheimer's disease. Oxidative stress has also been linked to aging...