This Week In Wellness researchers from Irish universities have shown that practising gratitude can help to “buffer” stress, both reducing the heart's reaction to stress and also improving its recovery. 

https://www.news-medical.net/news/20230126/Gratitude-has-a-unique-stress-buffering-effect-research-shows.aspx

https://www.sciencedirect.com/science/article/abs/pii/S0167876022002707?via%3Dihub

https://www.researchgate.nehttps://www.sciencedirect.com/science/article/abs/pii/S0167876022002707?via%3Dihubt/publication/44581429_Gratitude_and_well-being_A_review_and_theoretical_integration

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4927423/