There is no 'rule' if you're doing BFL w/ LC nutrition - it's something you have to tweak for yourself. I have been using milk quite liberally in my shakes - about 1/2 a cup every day with no ill effects.

All milk has approx 12g of carbs per cup, what changes is the fat content. As written BFL would advise skim or low fat milk, because it is a low fat program; done as a LC program I would think 2% would be fine.

A word of warning - if you've been doing strict Atkins for a while increase your carbs slowly and wisely - more veggies and lower glycemic fruits. Always combine your carbs with protein.

Nat