And that's exactly why, as we'll see in just a moment, we have enzymes that can actually control the formation of these harmful byproducts. So generally speaking, if these reactive oxygen species produce are not actually controlled, ros can actually react with cell components and cause something called oxidative damage. In fact, it's oxidative damage that is linked to the process of aging. So we age partially as a result of these reactive oxygen species. On top of that, oxidative damage has also been linked to a variety of different types of medical conditions and medical abnormalities. For instance, things like ischemia, diabetes, cervical cancer, liver damage as a result of alcohol overconsumption, emphysema and many other disease has been linked to this process of oxidative damage.