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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.

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

A 2020 review finds more than three-quarters of those serving on the boards of major medical organizations have received funding from industry. This indication of pervasive conflicts of interest among the leadership of leading U.S. medical organizations reveals the level of industry influence may be substantial.

Read MoreFinancial Ties Between Leaders of Influential U.S. Professional Medical Associations and Industry