Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A walnut is an edible seed produced by trees in the genus Juglans, from the Juglandaceae family. The most popular walnut species classified in this family are: English walnut, black walnut and white walnut trees. Many nutritionists and scientists have emphasized the health benefits of walnuts and their value in our daily life, especially by highlighting their role in the cholesterol’s management. Recently, according to a US study conducted by UCLA researchers and funded in part by the California Walnut Commission – walnuts could be a good natural solution to male infertility. To find out more about walnut and its medical properties – read this book.