For chronic disease, it takes a long time. For example, for dementia it takes 40 years for the onset of dementia and also dementia depends on the genetics. So, in a specific
genetic type it is healthy but has a cause in a body, so for dementia or cancer or atherosclerosis, takes a long time to develop. So taking Hydrogen is important for prevention. At least in animal experiments, hydrogen has a great role in preventing diseases. Because pre treatment with Hydrogen water is much more effective than post treatment. That suggests that hydrogen has a good role in prevention.