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forewordMichael F. Roizen, md,Professor and Chief Weüness Officer, Cieveland ClinicThis book has changed how I think. It's made me realize how important and how easy it is to keep my liver younger so it can keep me younger.And it has changed how I advise patients. Before 1990, most docs not specializing in liver diseases assumed that the liver was pretty resilient: if stressed by a one-night alcohol excess, it will recover, assuming it's no longer abused with alcohol or hasn't been attacked by a virus. The popular view was that liver diseases only affected people who abused their liver with alcohol or that the diseases were largely preventable. And after all, your liver would regenerate. If you allow me a quick diversion from medicine before 1990 to mythology, I want to quickly tell the story of Prometheus.Prometheus gave fire to the humans. His punishment from the gods for committing such a crime: the poor fellow was chained to a rock, where a vulture would peck out his liver. Amazingly, his liver would regenerate overnight. We're not sure how the Greeks knew of the liver's power, though it may be because they survived injuries to the organ in battle. While the Greeks were on to something, we're pretty certain that they didn't have as much insight into the liver as the scientific world did in 1990-and does today. The good news is that this myth was largely right. But doctors have also needed to learn a thing or two in the last thirty years.Up until about 1990 only 1 percent of us suffered loss of energy and vitality due to what we did to our liver with food and other lifestyle and toxin challenges. But that has changed: now 30 percent of Americans are afflicted with fatty liver disease-and with that, a lack of energy and a host of other problems. Remember Morgan Spurlock? In his film Super Size Me, he documented a month of eating nothing but fast food. The consequences? His weight and LDL cholesterol zoomed