Toronto: People who are optimistic are better at regulating stress as the hormone cortisol tends to be more stable in those with positive personalities, a new study has found.Researchers from Concordia University in Canada tracked 135 older adults over six years, and collected their saliva samples five times a day to monitor cortisol levels.This age group was selected because older adults often face a number of age-related stressors and their cortisol levels have been shown to increase.Participants were asked to report on the level of stress they perceived in their day-to-day lives, and self-identify along a continuum as optimists or pessimists. Each person`s stress levels were then measured against their own average.
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