I eat about 6 tablespoons of peanut butter at least a day, mainly because it is basically my only fat source, and that fats that is does have are the healthy fats. I eat a lot of sugar free and low fat things so peanut butter is a convenient source of calories and fats for me. By the way, i dont know if my way of eating so much peanut butter falls under the "peanut butter diet" but i recently lost 22 lbs still eating tons of peanut butter a day. By the way, be wary though because it is easy to over eat peanut butter. I measure out my peanut butter in tablespoons though.