Professor Tim Noakes has been found not guilty of misconduct, a professional conduct committee found.
Noakes held his head in his hands for a few seconds after being found not guilty and told media shortly after that he was "elated" with the outcome.
Noakes, whose book The Real Meal Revolution promotes a low-carbohydrate, high-fat (LCHF) diet, was called before the Health Professions Council of SA (HPCSA) after the former president of the Association for Dietetics in South Africa, Claire Julsing-Strydom, lodged a complaint against him.