Can our kidneys only process 30g of protein every 2 hours?

Question

I keep reading things online on how our kidneys can only process so much protein at one time...the rest gets stripped of amino acids and used as energy, goes to urea, or converts to fat. I know metabolism is extremely high after a workout, and our kidneys can absorb more protein during that time frame...but, other than that, how much protein can our kidneys absorb, and how long a time frame in between?

Answer 1

I know your body can only use so much protein. 30 grams every 2 hours sounds like a believable amount for a top rate of utilization for actually using it for protein-specific purposes like building muscle and repairing tissues. I believe that even for body builders the requirement for protein daily is probably not much more than 2 grams of protein per kilogram of body weight (or about 1 gram of protein per pound of body weight).

I believe it is actually digestion that absorbs protein and breaks it down into the amino acids the body can use. I think the kidneys just excrete the waste products (mainly urea) from the breakdown of the protein. If you have a high urea concentration in your blood from eating a lot of protein, the kidneys will just filter it out faster. This does cause your kidneys to increase their rate of filtration, which can be bad for them if you already have some kidney damage. Some people speculate that eating too much protein can be bad for even people with healthy kidneys, but that doesn't seem to be well-proven. The thing is, people don't always know it when they do have some kidney damage, since we can still function pretty well down to about 20% or less of our normal kidney filtration rate.

According to one study (see ndt... source below), "it appears, at least in the short term, that protein intake under 2.8 g/kg [of body weight] does not impair renal [kidney] function in well-trained athletes." A kilogram is 2.2 pounds, so 2.8 grams/kg = about 1.3 grams per pound of body weight.

Answer 2

2

Answer 3

1

Answer 4

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Answer 5

i don't know