When he turned 40, Dr Jimmy Gutman felt that he should break free from the ER and being a professor of emergency medicine at McGill University Medical School in Canada.
Now in his late 50s, the Canadian physician has established himself as a glutathione expert with his research on this essential antioxidant compiled in the book, Glutathione Your Key To Health.
"Emergency medicine is like professional sport. When you're over 40, you need to find something else to do," he said of his turning point in life. "I realised that instead of running around fixing broken things in the ER, it infinitely made more sense to prevent them from being broken in the first place."