Question

why do growing children require more proteins?

Answer 1

Because in this time children's would be energetic and digest fast

Answer 2

much now). In my opinion, a focus upon experiments with laboratory animals may have contributed to this exaggeration of the protein needs of children. A baby rat grows much faster than a human baby and doubles its birth weight in about 6 days whereas in a wholly breastfed baby this takes 4-6 months. This suggests that a baby rat needs relatively much more protein than a human baby and much more than an adult rat. Sure enough if one analyses rat milk then one finds that about 25% of the energy comes from protein (c.f. around 6% in human milk). Around 80% of the protein intake of young rats is needed for growth and only about a fifth is needed for maintenance; consistent with the idea that baby rats need 5 times more than adults on a weight corrected basis. Did these sorts of observations about the high requirem
ent of the young of laboratory animals encourage scientists of past eras to assume that this also applied to human babies? It is an odd “coincidence” that the five times higher relative requirement for baby rats was the same figure given as the relative requirement of human babies compared to adults
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