Jack Challem
Jack Challem is one of America's most trusted nutrition and health writers and a member of the American Society for Nutrition. Based in Tucson, Arizona, he is the bestselling author of more than twenty books.
Jack Challem is one of America's most trusted nutrition and health writers and a member of the American Society for Nutrition. Based in Tucson, Arizona, he is the bestselling author of more than twenty books. See less