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What does this mean?
Protein contains carbon, hydrogen, oxygen, nitrogen and other atoms making each amino acid distinct (amino acids make up proteins). The final products of protein catabolism (breakdown) include carbon dioxide, water, ATP (energy), urea and ammonia. The liver and kidney convert ammonia to urea, which is then excreted through the kidneys. This excretion process requires lots of water and increases the Glomerular pressure and filtration rate mentioned above.
Conclusion:
This increased filtration rate adaptation is a safe adaptation that takes place in the kidney as a result of a prolonged high protein diet. This myth is NOT true! Only if you have preexisting kidney disease should you look at reducing protein intake.
Supporting literature review: Martin et al, Nutrition & Metabolism, 2005, 2:25
“While protein restriction may be appropriate for treatment of existing kidney disease, we find no significant evidence for a detrimental effect of high protein intakes on kidney function in healthy persons after centuries of a high protein Western diet.”
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