A simple 'thank you' among couples can go a long way: Research

Individuals who feel appreciated by their partners have better-functioning relationships that are more resilient to internal and external stressors, said researcher Allen W. Barton, a professor of human development and family studies at the University of Illinois Urbana-Champaign.

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Over a 15 - month period, Barton’s team examined the effects that expressed gratitude — conveying appreciation to one’s partner — and perceived gratitude — feeling valued and appreciated by one’s partner — had on the relationships of 316 couples.