I had never heard of the "Gold Coast Cure" so I did a web search just now. There's quite a bit of info out there ... it is the name of a book by somebody who has MS and available on the popular sites that sell books.
The premise seems to be based on a combination exercise and the "Swank Diet". The Swank Diet has been around for a while ... I remember finding "older" books about it when my husband was first diagnosed.
My general impression of the diet was that it seems like a healthy eating plan that controls fats and processed foods. It won't hurt you, but not sure if it will help w/ MS although its supporters would claim otherwise.
If you search for "Swank Diet", you'll get lots of info. Good luck.