Stress: Can Stress Cause Weight Gain? (cont.)
"These hormones give us the biochemical strength we need to fight or flee our stressors," Epel tells WebMD.
The hormones released when we're stressed include adrenalin -- which gives us instant energy -- along with corticotrophin releasing hormone (CRH) and cortisol. While high levels of adrenalin and CRH decrease appetite at first, the effects usually don't last long.
And cortisol works on a different timetable. Its job is to help us replenish our body after the stress has passed, and it hangs around a lot longer. "It can remain elevated, increasing your appetite and ultimately driving you to eat more," says Epel.
While this system works fine when our stress comes in the form of physical danger -- when we really need to "fight or flee", and then replenish -- it doesn't serve the same purpose for today's garden-variety stressors.
"Often, our response to stress today is to sit and stew in our frustration and anger, without expending any of the calories or food stores that we would if we were physically fighting our way out of stress or danger," says Shawn Talbott, PhD, an associate professor in the Department of Nutrition at the University of Utah and author of The Cortisol Connection.
In other words, since your neuro-endocrine system doesn't know you didn't fight or flee, it still responds to stress with the hormonal signal to replenish nutritional stores -- which may make you feel hungry.
Following those stress signals can lead not only to weight gain, but also the tendency to store what is called "visceral fat" around the midsection. These fat cells that lie deep within the abdomen have been linked to an increase in both diabetes and heart disease.
To further complicate matters, the "fuel" our muscles need during "fight or flight " is sugar -- one reason we crave carbohydrates when we are stressed, says endocrinologist Riccardo Perfetti, MD, PhD.
"To move the sugar from our blood to our muscles requires insulin, the hormone that opens the gates to the cells and lets the sugar in," says Perfetti, who directs the outpatient diabetes program at Cedars Sinai Medical Center in Los Angeles. And high levels of sugar and insulin set the stage for the body to store fat.
"So people who are under stress, metabolically speaking, will gain weight for that very reason," Perfetti tells WebMD.
Mind Over Matter
As much as we would like to blame all our weight gain on stress, experts say that eating in response to stress can also be a learned habit -- one that's merely encouraged by brain chemistry.
"Under stress, there's an impulse to do something, to move, and often, eating becomes the activity that relieves the stress. It's easy to do and it's comforting," says David Ginsberg, MD, a psychiatrist and director of the Behavioral Health Program at New York University Medical Center.