Final answer:
Kelly McGonigal confesses her changed belief about stress and its impact on health at the beginning of her talk.
Explanation:
Health psychologist Kelly McGonigal confesses at the beginning of her talk that she used to believe stress was harmful, but her research led her to realize that it's our beliefs about stress that determine its impact on our health. McGonigal shares that by viewing stress as a positive response that helps the body rise to challenges, individuals can experience improved health outcomes.
Learn more about Belief about stress and its impact on health here:
https://brainly.com/question/33054613
