You are not what you eat during physiological stress: Isotopic evaluation of human hair

Variation in δ 13 C and δ 15 N values can be assessed to understand not only diet, but also the influence of physiological factors on an individual. The metabolic balance of an individual can impact isotopic signals in tissues that are forming during the periods of metabolic stress. Fluctuating δ 15 N values are associated with physiological stressors that alter an individual's metabolism such as infection, injury, or pregnancy. This study...