Excellent video worth checking out, courtesy of https://www.dietdoctor.com:
In the interview, Dr. Phinney stresses the importance of dietary fat comprising the vast majority of one’s diet. No surprise there (for me), but what was surprising and really quite discouraging is that if you eat an excess of carbohydrates, even over a relatively short period like a single day, and come out of ketosis then it is as if you are starting all over again. Dr. Phinney uses an excellent metaphor to explain this: it’s like walking along the top of a narrow sand dune (hill?) – it’s really tough getting there and there is little room for deviation once at the top.
I have not read Dr. Phinney’s new book, The Art and Science of Low Carbohydrate Living: An Expert Guide to Making the Life-Saving Benefits of Carbohydrate Restriction Sustainable and Enjoyable, but definitely now have it on my must-read list.