The nutrition literature base is really small, and smaller for children. Most studies focus on diets for special needs children, so there isn't a whole lot on protein requirements in children other than the RDA numbers, which may or may not be grounded in any sort of published evidence. The only studies on high protein diets and children that I was able to find had to do with autism. So I guess the renal consequences of high protein in children is a neat little black box no one's really peered into yet. If Tony can find some studies, I'll read 'em though.
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