Increased in carbon isotope ratios of Brazilian fingernails are correlated with increased in socioeconomic status

ARTICLE OPEN Increased in carbon isotope ratios of Brazilian fingernails are correlated with increased in socioeconomic status Gabriela Bielefeld Nardoto 1 ✉, João Paulo Sena-Souza 2 , Tiago Borges Kisaka 1 , Fábio José Viana Costa 3 , Paulo José Duarte-Neto 4 , James Ehleringer 5 and Luiz A. Martinelli 6 ✉ High δ13 C in human tissues in Brazil indicate high consumption of C4 -based sources due to the consumption of highly processed food and animal protein. The significant positive correlation...