What are the key components of the Mediterranean diet?

In addition to a physically active lifestyle, the Mediterranean diet is rich in grains, fruits, vegetables, legumes, and nuts.  The majority of the fat in the diet is provided by olives and olive oil, and fish and seafood are generally eaten at least twice a week.  Foods from animal sources are limited as well as sweets.  Water should be abundantly consumed throughout the day. Equally important, meals are to be enjoyed with friends and family.