I went through Kaiser. When I first attended their orientation meeting, I had to fill out a packet of information. I only had to write down all the diets that I had been on. I didn't need to show proof. After the packet was completed, they called an scheduled me for the Options classes. I hope this helps. As a side note, there is a group from this site that meets about once a month. If you are interested, let me know and I can forward the information.
Michelle