Uncontrollable chronic stress affects eating behavior in rats.

The issue of whether the decrease in food intake induced by inescapable shock is due to the uncontrollability of the stressor or the shock per se has not yet been settled. Besides, whether food intake is differentially affected by an uncontrollable chronic stressor has been explored only by a few studies. Thus, we evaluated the effects of chronic escapable or inescapable electric shocks on eating behavior. Rats were exposed to shock sessions for 20 days in two occasions separated by baseline sessions with no shock in an ABAB design. Results showed a reduction in food and water intake and body weight gain during stress periods, especially with inescapable shocks. The findings support a close link between learned helplessness, chronic stress, and eating behavior.