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By Davey Dunn

Do Regular High Protein Diets Have Potential Health Risks on Kidney Function in Athletes?
A study done at the University of Brussuls examined the effects of high protein diets in trained athletes. The study investigated body-builders (BB) and other well-trained athletes (OA) with high and medium protein intake. The athletes underwent a 7-day nutrition record analysis as well as blood sample and urine collection to determine the potential renal consequences of a high protein intake. The data revealed that despite higher plasma concentration of uric acid and calcium, Group BB had renal clearances of creatinine, urea, and albumin that were within the normal range. The nitrogen balance for both groups became positive when daily protein intake exceeded 1.26 g /kg bodyweight; but there were no correlations between protein intake and creatinine clearance, albumin excretion rate, and calcium excretion rate. The scientists concluded that protein intakes as high as 2.8 g /kg bodyweight do not impair renal function in well-trained athletes as indicated by the measures of renal function used in this study

COMMENTARY: We have heard from a lot of Doctors that it is dangerous to the kidneys to ingest more than the RDA of protein each day (.80 g/kg bodyweight). Unfortunately such a low amount is not conducive to muscle growth. This study showed that athletes who use much higher dosages of protein (up to 2.8 g /kg bodyweight) show no adverse effects according to normal measurements of kidney function.
WHAT CAN WE LEARN FROM THIS STUDY? An athlete can safely ingest as much as 2.8g per kilogram of body weight of protein each day. This means a man who weighs 220 pounds can take in 280 grams of protein without fear of overly stressing his kidneys.

Poortmans JR, Dellalieux O. Do Regular High Protein Diets Have Potential Health Risks on Kidney Function in Athletes Int J Sport Nutr 2000 Mar;10(1):28-38

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