For this study, we selected archaeological hair samples from 10 individuals from Dakhleh Oasis, Egypt. This study uses growth phase to determine the effects of age, sex, and health status on carbon and nitrogen isotopic ratios of hair analyzed in sequential segments. It is assumed that, at any given time, $85–90% of scalp hairs are actively growing, while the remaining 10–15% have transitioned into a resting or inactive phase, which lasts up to 4 months before hairs are shed. However, bulk hair samples typically contain a growth cycle error, which may conceal or confound the most recently incorporated isotopic infor- mation. A recent trend in stable isotopic analysis involves the reconstruction of short-term variations in diet using hair segments.
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