Increased in carbon isotope ratios of Brazilian fingernails are

USGS -- You are what you eat

Zinc isotope ratios measured for the four types of gloves tested in

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Box-whisker of   C (a) and  5 N (b) of in natura plants used as

Impacts of market economy access and livelihood conditions on agro-food transition in rural communities in three macro-regions of Brazil

USGS -- You are what you eat

Changes in the leaf carbon isotope ratios of vegetation along an

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

Carbon and nitrogen isotopic composition of commercial dog food in Brazil [PeerJ]

Longitudinal isotope ratio variations in human hair and nails - ScienceDirect

The potential for a carbon stable isotope biomarker of dietary sugar intake - Journal of Analytical Atomic Spectrometry (RSC Publishing) DOI:10.1039/C3JA50339A