I'm not sure about the fat-loss issue but I'd guess that something that digest more slowly like egg or casein protein would be better. Theoretically egg and casein proteins would be better at night since they will absorb more slowly and deliver amino acids slowly as you sleep. Some people like to have both whey and a slower protein before bed. Whey is better when your want fast absorption such as post workout. Also a whey powder that contains whey concentrate will have more fat and lactose. But not a lot.
But the number one thing I would like to point out is that these are supplements. If you are on a truly high protein diet then not one of these proteins is likely to have noticable "benifits" over the others. As your protein intake goes down then the quality of your individual sources of protein becomes more important. But all these proteins, especially whey and egg, are high quality proteins, and the only real difference is the speed at which they are absorbed.
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Originally Posted by Lyle Macdonald
BV is measured at levels below the maintenance level. As protein intake goes up, the BV of that protein goes down. For example, milk protein shows a BV near 100 at intakes of 0.2 g/kg. As protein intake increases to roughly maintenance levels, 0.5 g/kg, BV drops to 70 or so (9).
To quote from Pellett and Young, "....protein is utilized more effectively at suboptimal levels than at levels in the near-maintenance range of intake. Accordingly biological measures of protein quality conducted at suboptimal levels in either experimental animals or human subjects may overestimate protein value at maintenance levels." (9) Therefore, while BV may be important for rating proteins where intake is below requirements, BV has little bearing on individuals with protein intakes far above requirements.
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