A new breakthrough study published in the September 2 online edition of the journal Stress: The International Journal on the Biology of Stress has discovered a biological marker in your hair to measure chronic stress.

Researchers at The University of Western Ontario (Western) in Canada and Meir Medical Centre in Kfar-Saba in Israel collaborated to test a new method of measuring the stress hormone cortisol in strands of hair from 56 male patients experiencing a heart attack.