<qa>  What is the cause of oxidative stress?While it is well accepted that a low level of RONS production is necessary to maintain physiological function, too much formation of RONS are believed to participate in biomolecules damage. Damage of lipids, proteins and DNARNA, to cellular and tissue level, as a consequence of oxidative stress has been linked to a number of serious diseases, including cancer, cardiovascular diseases CVDs such as hypertension and atherosclerosis, neurodegenerative diseases such as Parkinsons disease and Alzheimers dementias, diabetes and the process of aging. 