
Originally Posted by
Poita
it's not the WPI or WPC that turns to paste, it's the casein.
WPI will be absorbed in around 20mins, WPC takes a bit longer and casein takes 6-8 hours.
Here's a blurb from the ******* website which might help explain the absorbtion difference for you:
Perhaps the most striking difference between whey and caseinates is the rate of digestion and absorption into the body. After consuming whey proteins there is a rapid rise in levels of blood amino acids which returns to baseline in approximately 2 hours. Casein, however, coagulates in the stomach, forming a curd, and is digested far more slowly, leading to a more moderate rise in blood amino acids that is sustained for up to 7 hours.
In terms, of muscle hypertrophy, whey could be considered a 'fast protein' which promotes protein synthesis (ie. it's anabolic) whereas casein is a 'slow protein' which significantly slows protein breakdown (ie. it's anti-catabolic). The bio-active peptides in casein may also have anabolic and anti-catabolic effects.
This is a slow digesting protein that is ideal for maintaining plasma amino acid levels and a positive nitrogen balance during times of fasting (eg. while you're asleep).
In an interesting study by Demling and DeSanti (2000), over-weight untrained men were placed on a diet, given a resistance training program and took supplemental protein either as a hydrolysed casein protein blend or as a whey protein blend. The subjects who supplemented their diet with the hydrolysed casein protein blend lost 3kg more fat and gained 2kg more muscle than those supplementing with the whey protein blend. Unsurprisingly, increase in strength was 31% greater in the casein group.
Thus it appears calcium caseinate may be useful in promoting muscle gain and fat loss while dieting especially in untrained individuals.