Reactive oxygen species (ROS) are highly reactive molecules and free radicals formed as a natural byproduct of oxygen metabolism. These molecules, which are present at low levels in normal cells, play a vital role in maintaining healthy redox processes and ensuring proper function in the cells. However, an overproduction of ROS may cause oxidative stress, cellular damage, and DNA damage, which may lead to several physiological and pathological conditions.
Despite the advances in modern medicine, no one knows for sure what causes amyotrophic lateral sclerosis (ALS), also called Lou Gehrig’s disease. Scientists can only theorize and speculate as to what causes it, but they still don’t have a conclusive answer to this question.