Sport biological value

Sport Fitness
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jarrick

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from what i've read on the net, the biological value (BV) is a value given to how well protein from a particular source is taken up by the body (the higher the value, the more is taken up)
This is how i undedstand it so correct me if i'm wrong: proteins are made up of amino acids so when one source of protein (ie milk) is broken down by the body into amino acids, they are exactly the same as the amino acids from a different source (ie soya) but in different amounts.
So does that mean that the BV is dependant on the ratios of the various amino acids present? in which case, would it be possibe to take two relatively low BV sources of protein and make the BV higher by combining them?
 
Well dont forget there are lots of different amino acids so proteins may differ in that respect.
 
yes, not all proteins are created equal. animal proteins are complete (have all essential amino acids) while plant sources are incomplete and need to be paired to complete the protein profile (this is why vegetarians and vegans have to be smart about how they eat or their health can really suffer)

soy is MUCH debated. some say its not a complete protien, others say it is.
some research shows it increases estrogen in men (BAD), other research disproves that, some says it helps prevent cancer...blah blah blah.

What I do know is that a LOT of poeple get really gassy and bloated if they injest very much soy protein.

i believe in moderation...so i neither seek out soy, nor run far from it. but its definitely not a big part of my diet.

back to the question of BV, sometimes this gets used interchangably with 'bio-availability'...which is basically absorption level of the nutrient in question. a multivitamin with poor bio-availability means a lot of it goes right through you without being absorbed.
 
yeah - i get all that. what i was thinking was that maybe it was possible to make a recipe for a really high BV protein mix. I got this following info from some site (and god knows if it's accurate or not or where they got it from):

Amino Acid % Required for human growth
Alanine 2.5
Arginine 9.0
Aspartic acid 2.0
Asparagine 5.5
Cysteine 0.5
Glutamic acid 10.0
Glutamine 10.0
Glycine 3.5
Histidine 2.0
Isoleucine 6.0
Leucine 9.0
Lysine 10.0
Methionine 5.0
Phenylalanine 2.5
Proline 2.0
Serine 5.0
Threonine 4.0
Tryptophan 3.0
Tyrosine 2.5
Taurine 1.0
Valine 5.0

so by combining say, soy protein and wheat protein, you may end up with all the necesary amino acids but for all the ones that are over the percentage, they'll be unused and excreted as there won't be enough of the others to make use of them so that's probably why it would be a lower BV than a combination that produces the exact ratio's needed for human growth and maintenance. I might just be making this all up, by the way, as i'm just extrapolating from stuff i've read here and there. but if it does work that way, has anyone discovered a perfect mix of nuts beans and seeds that will do the job?
any biochemists out there?
 
dont believe the hype; here's another list i found someplace saying what the RDA of essential amino acids are for a 70kg human;

Phenylalanine: 980mg
Leucine: 980mg
Methionine: 910mg
Lysine:840mg
Isoleucine: 700mg
Valine: 700mg
Threonine: 490mg
tryptophan: 245mg
Histidine: unknown
Arginine Unknown

and Recomended Daily Alowence is not the same as Optimal Daily Alowence.
 
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