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Once you understand what a Biological value is, for protien, you can see why whey isolate is inferior. 
Although one gram of protein will contain four calories in all cases, the amount of protein which our body can digest and use for muscel building purposes is not always 100%. In fact, the most easily digestible natural protein source are whole eggs, where the percentag net utilization by our bodies is 94%. Because eggs contain the best protein digestion rate of any natural source, eggs are given a protein rating of '100' and all other protein containing food sources are rated according to how digestible they are compared to egg protein.
AS we all know (and SHOULD be using), there exists protein powders which digest even easier than egg protein and can be utilized by our bodies even more than the 94% that natural egg protein can be. These protein powders would have a protein rating higher than 100 on the scale below.
So here it is... Biological Value
The BIological Value (BV) is a scale of measurement used to determine what percentage of a given nutrient source is utilized by the body. The scale is most frequently applied to protein sources, particularly whey protein. Biological Value is derived from providing a measure intake of protein, then determining the nitrogen uptake versus nitrogen excretion. THe theoretical highest BV of any food source is 100%. To break it down .... - BV refers to how well and howe quickly your body can actually use the protein you consume.
Here is a list of various sources of protein and their respective ratings.
Protein Ratings
FOOD PROTEIN - RATING
Eggs (whole) - 100
Eggs (whites) - 88
Chicken / Turkey - 79
Fish - 70
Lean Beef - 69
Cow's Milk - 60
Brown Rice - 57
White Rice - 56
Soybeans - 47
Whole-grain Wheat - 44
Peanuts - 43
Dry Beans - 34
White Potato - 34
As far as sources of protein created in the lab are concerned, here is a short list of some protein sources you can find in most supplements common today. YOu cann see how they compare to the natural sources listed above:
Protein Ratings
PROTEIN SUPPLEMENT - PROTEIN RATING
Whey Protein Isolate - 159
Whey Protein Concentrate - 104
Casein - 77
Soy - 74
You can see that whey isolate has the highest BV of any protein source. You get the most bang for the bucl. This is usually why it is so damn expensive. I recommend to buy flavourless whey isolate. That way you are not paying for any sugar weight, just pure high grade protein.
I also would recommend taking it with water although many dont for this reason...
http://www.elitefitness.com/forum/showthread.php?threadid=267290&perpage=20&pagenumber=4
Scroll down and see my post at the middle of the page. Hope some of you find this usefull.
Cheers,
Mavy
Although one gram of protein will contain four calories in all cases, the amount of protein which our body can digest and use for muscel building purposes is not always 100%. In fact, the most easily digestible natural protein source are whole eggs, where the percentag net utilization by our bodies is 94%. Because eggs contain the best protein digestion rate of any natural source, eggs are given a protein rating of '100' and all other protein containing food sources are rated according to how digestible they are compared to egg protein.
AS we all know (and SHOULD be using), there exists protein powders which digest even easier than egg protein and can be utilized by our bodies even more than the 94% that natural egg protein can be. These protein powders would have a protein rating higher than 100 on the scale below.
So here it is... Biological Value
The BIological Value (BV) is a scale of measurement used to determine what percentage of a given nutrient source is utilized by the body. The scale is most frequently applied to protein sources, particularly whey protein. Biological Value is derived from providing a measure intake of protein, then determining the nitrogen uptake versus nitrogen excretion. THe theoretical highest BV of any food source is 100%. To break it down .... - BV refers to how well and howe quickly your body can actually use the protein you consume.
Here is a list of various sources of protein and their respective ratings.
Protein Ratings
FOOD PROTEIN - RATING
Eggs (whole) - 100
Eggs (whites) - 88
Chicken / Turkey - 79
Fish - 70
Lean Beef - 69
Cow's Milk - 60
Brown Rice - 57
White Rice - 56
Soybeans - 47
Whole-grain Wheat - 44
Peanuts - 43
Dry Beans - 34
White Potato - 34
As far as sources of protein created in the lab are concerned, here is a short list of some protein sources you can find in most supplements common today. YOu cann see how they compare to the natural sources listed above:
Protein Ratings
PROTEIN SUPPLEMENT - PROTEIN RATING
Whey Protein Isolate - 159
Whey Protein Concentrate - 104
Casein - 77
Soy - 74
You can see that whey isolate has the highest BV of any protein source. You get the most bang for the bucl. This is usually why it is so damn expensive. I recommend to buy flavourless whey isolate. That way you are not paying for any sugar weight, just pure high grade protein.
I also would recommend taking it with water although many dont for this reason...
http://www.elitefitness.com/forum/showthread.php?threadid=267290&perpage=20&pagenumber=4
Scroll down and see my post at the middle of the page. Hope some of you find this usefull.
Cheers,
Mavy
