Obesity continues to accelerate resulting in an unprecedented epidemic that shows no significant signs of slowing down any time soon. The World Health Organization reports that in 2016, nearly 2 billion adults were overweight and that worldwide obesity has nearly tripled since 1975. Obesity: Global Impact and Epidemiology is an important tool in proving a link to new knowledge, serving researchers and clinicians. The field of obesity is evolving very quickly and there is an abundance of scientific data that has emerged and is emerging constantly. Researchers and physicians need new updated information about the epidemiology and global impact of obesity that come from authors that have a wide perspective in the field. For health professionals and researchers, there is a need to understand how obesity begins. While a simple question, the answer is very complex.