Pleasurable behaviours ‘reduce stress’

Whether it's food or sex,pleasurable activity provides more than just pleasure - it actually reduces stress by inhibiting anxiety responses in the brain,say researchers. Experiments,carried out by a team at University of Cincinnati,also indicated that the reduced-stress effects continued for at least seven days,suggesting a long-term benefit,the 'Proceedings of the National Academy of Sciences' journal reported. "These findings give us a clearer understanding of the motivation for consuming 'comfort food' during times of stress. But it's important to note that based on our findings,even small amounts of pleasurable foods can reduce the effects of stress," said team leader Yvonne Ulrich-Lai. For their experiments,the researchers provided rats twice daily access to a sugar solution for two weeks,then tested the animals' physiological and behavioural responses to stress. Compared with controls,rats with access to sugar exhibited reduced heart rate and stress hormone levels while placed in ventilated restraint tubes and were more willing to explore an unfamiliar environment and socially interact with other rats. Rats who were fed a solution artificially sweetened with saccharin (instead of being fed sucrose) showed similar reductions in stress responses,the researchers say,as did rats who were given access to sexually responsive partners. But sucrose supplied directly to the stomach did not blunt the rats' stress response,the researchers say. "This indicates that the pleasurable properties of tasty foods,not the caloric properties,were sufficient for stress reduction," said Ulrich-Lai. Physiological responses to stress include activation of the hypothalamic-pituitary-adrenocortical axis,regulated by the brain structure known as the basolateral amygdale(BLA). Rats exposed to pleasurable activities,such as tasty foods and sex,experienced weakened HPA axis responses to stress,the researchers found. Lesions of the BLA prevented stress reduction by sucrose,suggesting that neural activity in the BLA is necessary for the effect. "Our research identifies key neural circuits underlying the comfort food effect. Further research is needed,but identification of these circuits could provide potential strategies for intervening to prevent or curtail increasing rates of obesity and other metabolic disorders," said Ulrich-Lai.