Vegan nutrition encompasses the nutrients vegans require for a balanced diet. It is an important part of a vegan's life, as it is the foundation for determining which foods should be consumed based on their lifestyle choices. A balanced vegan diet includes: whole grains, pulses and legumes, a variety of vegetables, nuts and seeds, a variety of fruits, fungi (mushrooms), sea vegetables (laver, arame, kombu)and mineral foods (for a B12 source). There are many vegan food guides available through the American Vegan Society and the Vegetarian Resource Group. Sufficient amounts of all the essential nutrients required for human health are easily obtained from the these guidelines. Vegan nutrition usually refers to the intake and balance of nutrients throughout a day, and therefore is dually classified under dietary regimes and practices.