I was just browsing the best seller list on Amazon and was amazed to see Wheat Belly still way at the top well over a year after first published:

Amazon Best Sellers Rank: #27 in Books (See Top 100 in Books)
#1 in Books > Health, Fitness & Dieting > Diets & Weight Loss > Gluten Free
#2 in Books > Health, Fitness & Dieting > Nutrition
#2 in Books > Health, Fitness & Dieting > Diets & Weight Loss > Weight Loss

The Kindle version is also on these lists. (Why it would be separate seems a bit weird to me.)

The cookbook seems to be doing well too.

I just recently read Dr. Lustig's book, Fat Chance, and couldn't help but think "if only he had read Dr. Davis's book too". I thought the first part of the book where he discusses the evilness of sugar and in general takes on "calories in, calories out" quite effectively, and even caustically, was quite impressive but then he totally wimped out with his diet recommendations. Quite disappointing really.