“…The results have been contradictory and no single biomarker of stress-related illness has emerged (Danhof-Pont et al, 2011;Grossi et al, 2015;Kudielka, Bellingrath, & Hellhammer, 2006;Pruessner, Hellhammer, & Kirschbaum, 1999). Although the main symptoms of stress-related conditions are exhaustion, lack of energy, and fatigue that is no longer responsive to normal periods of rest (Sonnenschein, Sorbi, van Doornen, Schaufeli, & Maas, 2007), much less attention has been directed at elucidating metabolic processes and the ability to mobilize energy.…”