Diseases are manifested when the body's immune system is unable to 'control' the rate at which mutated cells reproduce, or because internal organs are so depleted of proper nutrients that they fail to function as they should. If you have a strong immune system, then you have far less to fear from 'germs', 'bacteria', 'viruses', even 'cancer'. MEDICAL SCIENCE does not have a 100% 'success' rate for anything they have developed. They have data and a body of evidence based on their 'results' which they offer as proof. So does NUTRITION, the difference is that proper nutrition, while not ever claiming to 'cure' any disease, also does not cause 'possible' side effects (other than a better immune system and the potential for self-healing).