For people who don't like the carb curve, Phil Maffetone has a Two-week test where you can determine your own carb curve. Actually, the two weeks just help determine if you have any carb intolerance and after that it's fairly painstaking to determine your own carb curve. No carb intolerance, no need to cut back, but stay away from processed grains.
Phil Maffetone, www.philmaffetone.com - 2 Week Test
I think Mark is coming from the position that if you are Ken Korg, typical office guy in his 40s with the expanding waistline, you probably have insulin resistance if not full on metabolic syndrome. You're probably an average person, if you follow these average numbers you are going to see positive results. These average numbers are probably based on an average 2000 calorie a day diet with carb numbers based on the myriad of other low carbohydrate diets out there. If you aren't Ken Korg, then you aren't exactly his audience.
If he doesn't have references in his book, you might need to try a different book with similar recommendations. His book is available at a local bookstore in my town so if you have a well-stocked bookstore, you might try looking for his book there to see if you'd like to purchase it.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 157.5 x 2