If fasting has been around since the beginning of time, why is it so controversial? Dr. Jason Fung has a different perspective. When done right, fasting should not be controversial at all. In fact, it should be one of our most powerful tools for treating insulin resistance, metabolic syndrome, obesity and diabetes. He also believes insulin resistance has an even further reaching impact on our health affecting our risk of cancer and our chance for longevity. As the foremost expert on fasting, Dr. Fung has a perspective we can all learn from.