Jodi Ford, Ohio State University (IMAGE) Ohio State University Caption Ford's study found evidence that both high and low cortisol levels in hair correspond to an increased risk of depression. Credit The Ohio State University Usage Restrictions credit Ohio State License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.