I'll step in for a moment, and mention that Lutz does NOT recommend dropping carbs to very low levels, and does not even believe in the Atkins induction approach and recommends against it. He did experiment early on with very low carb levels, but settled on the 6 bread units, roughly 72 grams of starchy carbs per day, for a number of reasons mentioned in his german-langauge books.

Unfortunately his english version of Life Without Bread does not really cover that point as well, from what I recall - I loaned my english version out, so I'm going from memory of some years back.

Kwasniewski is another that doesn't recommend following under a certain level of carbs per day; I believe about 50 in his case.