article_snippet: Environmental stress could include the aging process, smoking, pollution, traumatic brain injury or excessive alcohol consumption. '
article_snippet: In fact, it can do more harm than good. '
article_snippet: Excessive production of nitric oxide leads to brain cell damage and promotes neurodegenerative diseases such as cerebral ischemia, Parkinson's disease and Alzheimer's disease.
article_snippet: byproduct, nitric oxide,' Gu said. '
highlights_snippet: Could even prevent diseases such as Alzheimer's and Parkinson's .