I’ve found a form of training that makes many people very fit and a few very cross. It is aptly named CrossFit. I came across it, of all places, while covering the Health Professions Council of SA (HPCSA) hearing against University of Cape Town emeritus professor Tim Noakes in Cape Town last month. I interviewed superfit "proudly South African kiwi" Dr Caryn Zinn, an academic at Auckland University of Technology in New Zealand and a registered dietitian. She is one of three expert witnesses who flew in to give evidence for Noakes. The HPCSA has charged him with unprofessional conduct for his views on butter, eggs, bacon and broccoli for babies. Zinn is a rare species: a dietitian who isn’t afraid to challenge conventional nutrition "wisdom" in her practice. She also does continuous research into optimum nutrition and low-carb, high-fat diets for sports performance and to treat and prevent serious disease. Zinn is a long-distance runner and does CrossFit a few times a week. She says ...

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