This diet is often called keto diet and it dates back to the 1920s. Endocrinologist Dr. Henry Geyelin created this diet to treat epilepsy. But later in 1921 Geyelin found that this type of food was actually effective on how the body processes nutrients and it lead to a fewer attacks in all patients.
Note to self: User Walden Farms as mayo sub. ~~This is the BEST chicken salad. It could not be easier or more delicious. With chicken, cranberries, apples, and pecans, it's wonderful on its own or as a sandwich!