Interesting topic. I think he's a bit too low with the 25-35 grams daily limit, almost like induction level.

Dr. Lutz, in his years of practice arrived at 72 grams daily, as explained in his book "Life Without Bread".

Dr. Atkins defines it as a personal limit, testable through finding a level that you maintain your weight at.

Some can go up to a 100 grams a day, and still lose and show ketones. It may depend on size and lean body mass, and/or activity level.

What other definitions are out there? I think we've asked that a lot here, but never nailed it down.

Wa'il