The second in a series of videos about Cognitive Reframing. The first video of the series can be viewed at https://youtu.be/Sq2f6Ak3-Ls
The source of information about Gratitude and heart disease at time stamp 8:33 is NIH News in Health at https://newsinhealth.nih.gov/2019/03/practicing-gratitude
The source of information about Gratitude affecting neural chemistry at time stamp 8:38–9:43 is https://www.brainbasedlearning.net/magic-power-gratefulness/