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. Urinary creatinine excretion correlates with muscle mass but is influenced by renal function and meat intake.
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Urinary creatinine excretion is a measure of the amount of creatinine, a waste product produced by muscles, that is excreted in the urine. Since muscle mass is the primary determinant of creatinine production, urinary creatinine excretion can be used as an indirect measure of muscle mass. However, other factors such as renal function and meat intake can also influence urinary creatinine excretion. Therefore, it is true that urinary creatinine excretion correlates with muscle mass but is also influenced by renal function and meat intake.