A great nonfiction science book tackling the confusing topic of weight loss, metabolism and exercises. First the author introduces the concepts very clearly and lays the foundation to understand the relationship in later chapters. The charts and graphs definitely help a lot! So metabolism is not fixed, and it could evolve and is evolving according to the energy intake and exercises energy consumption. Exercises cannot cause weight loss but can maintain weight loss. Exercises are important because it lifts our mood, clears our head and strengthens our body. (and I believe at the same time, strengthens our mental power as well). This is the most comprehensive and informative book on health. The other books mentioned by the author are [b:Exercised: Why Something We Never Evolved to Do Is Healthy and Rewarding|49358915|Exercised Why Something We Never Evolved to Do Is Healthy and Rewarding|Daniel E. Lieberman|https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1594006013l/49358915._SY75_.jpg|74795403], [b:Endure: Mind, Body, and the Curiously Elastic Limits of Human Performance|41014339|Endure Mind, Body, and the Curiously Elastic Limits of Human Performance|Alex Hutchinson|https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1533053130l/41014339._SY75_.jpg|56364072] and [b:Catching Fire: How Cooking Made Us Human|11148989|Catching Fire How Cooking Made Us Human|Richard W. Wrangham|https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1327538044l/11148989._SY75_.jpg|24362704].