CrossFit | Science

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The CrossFit stimulus—constantly varied high-intensity functional movement coupled with meat and vegetables, nuts and seeds, some fruit, little starch, and no sugar—prepares you for the demands of a healthy, functional, independent life and provides a hedge against chronic disease and incapacity. This stimulus is elegant in the mathematical sense of being marked by simplicity and efficacy. The proven elements of this broad, general, and inclusive fitness, in terms of both movement and nutrition, are what we term our CrossFit Essentials.

Over his more than 40-year career, pediatric neuroendocrinologist and New York Times bestselling author Dr. Robert Lustig has been dedicated to treating and preventing childhood obesity and diabetes. In his new book, Dr. Lustig exposes the truth, both scientifically and politically, underlying the current global pandemic of diet-related diseases. In this excerpt from chapter 8, he describes the two pathways that fuel energy metabolism and explains how different food sources affect the body at the cellular level.

Read MoreMetabolical: The Lure and the Lies of Processed Food, Nutrition, and Modern Medicine — Excerpt 2

Over his more than 40-year career, pediatric neuroendocrinologist and New York Times bestselling author Dr. Robert Lustig has been dedicated to treating and preventing childhood obesity and diabetes. In his new book, Dr. Lustig exposes the truth, both scientifically and politically, underlying the current global pandemic of diet-related diseases. In this excerpt, he explains how the precepts of cell biology discussed earlier in chapter 8 (excerpts 1 and 2) present a new way to think about the role of diet and nutrition in the development of non-communicable diseases.

Read MoreMetabolical: The Lure and the Lies of Processed Food, Nutrition, and Modern Medicine — Excerpt 3

Over his more than 40-year career, pediatric neuroendocrinologist and New York Times bestselling author Dr. Robert Lustig has been dedicated to treating and preventing childhood obesity and diabetes. In his new book, Dr. Lustig exposes the truth, both scientifically and politically, underlying the current global pandemic of diet-related diseases.

Read MoreMetabolical: The Lure and the Lies of Processed Food, Nutrition, and Modern Medicine — Excerpt 1

This 2007 study found increased pancreatic fat is strongly associated with diabetes, independent of overall BMI or waist circumference. These results support the hypothesis that organ-specific fat accumulation, due to its effect on insulin sensitivity and glucose tolerance, directly predicts and may play a causal role in the development of metabolic distress.

Read MorePancreatic Fat Content and β-Cell Function in Men With and Without Type 2 Diabetes