Just to make it sound a little less painful, its 3 pints of protein drink from the top manufactuers. EAS for example, make a product called Myoplex that has 42g of protein per serving. If you can get into this its a great weight off your mind regarding maintaining LBM. Of course 1 pint of a watery choco drink on a cold morning isnt exactly appetizing, but its got to be done. This will cover someone with about 80Kgs / 180lbs of Lean Body Mass.
That's the reason we supplement with protein at about 1.5 grams/Kg body mass....to prevent LBM loss. This allows the body to stay in lipid metabolism primarily and lose weight.