It is a commitment, as there's a list of approved foods and anything not in that list is NOT ok... (any slip up means your coming out of ketosis and therefore not getting the desired weight loss, so I find that a really motivating thought...)
BUT, it's very easy because, aside from those foods, nothing else is allowed. No weighing. Measuring. Counting. (A little on Cruise phase if one eats "certain foods", but we tend not to...).
Phase 3 is only when you're at target - so we can all handle a bit of hard work when we're skinny minnies!