Dr. Stephan du Toit is a South African transplant to Valemount, BC, who has been achieving remarkable weightloss and health results for his patients, with a program named Eating for Life. He says he lost a lot of weight himself with his approach, and after keeping it off, realized this would be of benefit to his patients.
Details are sketchy, because he believes patients need to be closely monitored, but the broad outline seems to be very similar to what the Grain Ride is about: cutting out sugars, while encouraging unstarchy vegetables, and meat, eggs and cheese.
The theory behind this is to eliminate the sugars behind the bloodsugar highs and lows that rule the lives of most people on the Standard American Diet, influencing not only their weight, but also their sleep and mood swings.
Participants eat three meals a day, spaced five hours apart, with no snacking, which is a complete turnaround from the conventional dieting advice of numerous snacks throughout the day. Because Dr. du Toit's regime restricts the amount of sugar in the bloodstream, his approach is effective without leading to hunger, though he notes that the first three weeks are the hardest, as the body adjusts to its new routine.
Read more on page 2 of The Valley Sentinel and this article in the Rocky Mountain Goat. Also, check out this YouTube piece: