Stable isotopes in hair reveal dietary protein sources with links to socioeconomic status and health.

Indeed, there was a highly significant correlation among hair δ 13 C and δ 15 N values of all individual hair observations ( r = 0.475, n = 684, P < 0.0001), consistent with the concept that proteins contributing to an individual’s diet were largely a mixture of just two primary sources: C 3 -plant protein and C 4 -derived animal protein.

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