claim
The physiological limit on human protein consumption is caused by the high metabolic cost of processing protein for energy and the limited capacity of the liver and kidneys to excrete nitrogen-containing urea, a by-product of protein metabolism (Billsborough and Mann 2006; Rudman et al. 1973).
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Sources
- The role of Plant Foods in the evolution and Dispersal of early Humans kernsverlag.com via serper