This document discusses the importance of fitness and nutrition coaching due to widespread health issues like obesity and diabetes in the US. It explains that coaching provides personalized assessments of bloodwork, hormones, fitness levels and metabolism to create customized nutrition, meal and exercise plans, with accountability helping ensure long-term success. Coaching focuses on eating according to one's metabolism and body type, prioritizing the right macronutrients and adjusting as needs change. The three main macronutrients - carbohydrates, fats and proteins - are explored in detail regarding their functions, sources and myths.