Mark Adams is the author of Tip of the Iceberg: My 3,000 Mile Journey Around Wild Alaska, The Last Great American Frontier (out from Dutton May 15th) and New York Times bestselling books Meet Me in Atlantis and Turn Right at Machu Picchu. A writer for many national magazines, including GQ, Men's Journal, and New York, he lives near New York City with his wife and children.

Before Dr. Atkins, there was diet guru Bernarr Macfadden. His biographer, Mark Adams, tried out one of his all-natural diets and found he was stronger, sharper…and that he smelled like apples.