This book is intended for the average person and healthcare professionals who are looking a simple to understand source describing the basics of healthcare, and disease. Despite nearly a million different types of diseases, there are surprisingly just a few basics things one needs to understand in order to understand disease and how to prevent disease. There are discussions relating to USA Healthcare because it is in turmoil. But the basic discussion is on healthcare and the science of healthcare for all nations. The book covers the metabolic syndrome which the biggest factor in chronic disease in the USA as well as medical marijuana, chiropractic with heavy emphasis on prevention in light of our poor healthcare system. Their is a section of chiropractice as well. Medical marijuana is a major breakthrough in the world of epilepsy, depression, anxiety, pain and all chronic diseases which is why I dedicate a significant portion this publication to it.