In this book, Water: For Health, for Healing, for Life: You’re Not Sick, You’re Thirsty!
, Dr. F. Batmanghelidj explains why and how persistent dehydration leads to various chronic diseases, illnesses and ailments (including overweight and obesity) and cites  46 vital reasons why our bodies need adequate amounts of water every day.

Much of what Dr. Batmanghelidj explains in his book is summarized in this fantastic infographic entitled “Why Dehydration is Making You Fat and Sick”.

Source: Bittopper.com – Dehydration