I think it depends on what type of shakes your Dr/intuitionist recommends.
I go to true results, and they don't sell shakes, but my nutritionist recommends EAS Advantedge shakes, which are lower cal, low carb, no sugar, and high protein... she also like pretty much all of the EAS line (Myoplex, etc)
Some shakes can have alot of sugar in them == lots of carbs, but also lots of protein. Then there are some that are "zone" balanced... higher protein, but also some carbs and fat....