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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.

For the past 170 years, there have been two main competing ideas about what causes cardiovascular disease. One of them, the cholesterol or lipid hypothesis, has come to dominate. The alternative hypothesis has had different names over the years — e.g., the encrustation hypothesis, thrombogenic hypothesis, and response to injury hypothesis. In the first article in this four-part series, Dr. Malcolm Kendrick explains this alternative hypothesis, outlines its brief history, and proposes why it may have fallen out of favor.

Read MoreWhat causes cardiovascular disease? The response to injury hypothesis, Part 1

This trial indicates metformin suppresses gains in strength and muscle mass associated with resistance training in elderly patients. Its results support previous research suggesting the drug suppresses the benefits of resistance training in multiple populations. In patients who do not require immediate improvements in glycemic control, metformin’s suppression of exercise-induced muscle strength and size gains could increase risk of disability and mortality. These risks may provide an argument for not prescribing metformin to elderly patients. In diabetic and prediabetic patients, it is worth considering non-pharmaceutical treatments that lead to improved glycemic control without reducing the benefits of exercise.

Read the article Metformin blunts muscle hypertrophy in response to progressive resistance exercise training in older adults

Dr. David Diamond, a Ph.D. in biology and neuroscientist with 40 years of experience, speaks about cholesterol science and the various forms of deception apparent in research on cholesterol-lowering statins. Diamond developed an interest in cholesterol and statins in 1999 after being diagnosed with familial hypertriglyceridemia, a genetic anomaly that causes triglyceride levels in the blood to become elevated, leading to additional health complications such as obesity. After realizing that the dietary and pharmaceutical recommendations he was given were all wrong, Diamond began to investigate the sources of the misinformation. In this presentation, he shares how his discoveries conflict with received wisdom about cholesterol and statins and explains how and why we have been deceived by companies that seek to profit from our ignorance.

Watch David Diamond on Deception in Cholesterol Research: Separating Truth From Profitable Fiction

This 2019 review analyzed randomized controlled trials testing the effect of one or more dietary factors on heart disease incidence, heart disease mortality, or overall mortality. It found that nearly all common dietary patterns and supplements fail to reduce cardiovascular risk or overall mortality. Notably, no diet focused on modifying the amount or type of fat in the diet had any significant impact on overall mortality, cardiovascular mortality, or cardiovascular risk.

Read MoreEffects of Nutritional Supplements and Dietary Interventions on Cardiovascular Outcomes: An Umbrella Review and Evidence Map

Dr. Malcolm Kendrick discusses recent concerns in the medical community regarding the potential for bias in clinical research on statin therapy. He reviews the various reasons statin trials may be unreliable, including selective publication of results and strategic shifting of trial endpoints during ongoing studies. Despite the apparent evidence-based support of statin therapy and measures taken in the 1990s and early 2000s to mitigate bias, Kendrick urges doctors to proceed with caution when recommending the drugs. Echoing another review from 2015, Kendrick claims “a complete reassessment [of their efficacy and safety] is mandatory.”

Read MoreStatins — Are the Data Free From Bias?

Statins are the most widely prescribed class of drugs in the world and thought to be beneficial for reducing cardiovascular events and relatively risk-free. Dr. Malcolm Kendrick approaches such ideas with skepticism, here reviewing the research behind such claims and sharing the sleight-of-hand tactics used to promulgate them. While much of the data related to statin studies remains hidden from independent researchers, Kendrick finds that available data has been framed in misleading ways. Reviews of studies that tout statins’ effects on mortality reveal statistically insignificant outcomes and leave open the possibility that adverse events could offset statins’ very minuscule benefits.

Read MoreStatins — What Are the Benefits?

The authors of this 2016 review find compelling early mechanistic evidence that insulin and IGF-1 suppression may have anti-cancer effects. They also find substantial evidence to suggest diets that reduce insulin and IGF-1 levels reduce tumor progression in rats; human evidence, however, is preliminary.

Read MoreDietary and pharmacological modification of the insulin/IGF-1 system: exploiting the full repertoire against cancer

Statins inhibit the synthesis of cholesterol and decrease levels of low-density lipoproteins, which many believe are atherogenic. Since their development in 1987, statins have become the single most prescribed class of drugs in medicine, and well over 100 million people worldwide take them daily. Here, Dr. Malcolm Kendrick discusses some of the controversies surrounding the popular drugs and explains the evidence that suggests their benefits may be overstated and their adverse effects significantly underestimated.

Read MoreA Review of Statin Therapy

In this two-part series published in The New York Review of Books under the titles “The Epidemic of Mental Illness: Why?” and “The Illusions of Psychiatry,” Marcia Angell summarizes three books that strongly criticize the pharmaceutical treatment of psychiatric disorders, and particularly the role the pharmaceutical industry has played in shaping public and medical perception of them.

Read MoreMarcia Angell on Psychiatry and the Pharmaceutical Industry

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