We've discussed the effects of cortisol in the gym many times and research continues to support what we're saying:
"For the first time in humans, we are finding out that cutting your calories increases cortisol," said lead researcher A. Janet Tomiyama, a Robert Wood Johnson Foundation Health & Society Scholar at the University of California, San Francisco.
"We think this may be one reason dieters tend to have a hard time keeping weight off in the long-term," she said.
People who count calories feel stressed, she said, but it's the reduction in calories that increases cortisol, which, in turn, stresses the body and leads to weight retention.
"No matter how you cut calories, whether that's doing it on your own, or doing something like Nutrisystem or Jenny Craig, it doesn't matter, it's still going to increase your cortisol level," she said.
Read more here:http://www.covenanthealth.org/HealthDay/4_2010/637842
Cortisol is not only increased by cutting calories but also under sleeping, stress and over training. Hormonal regulation, including insulin, glucagon and cortisol are key to optimizing body composition, performance and well being.