Being GRATEFUL is healthy for you...

7 Scientifically Proven Benefits Of Gratitude That Will Motivate You To Give Thanks Year-Round:
1. Gratitude opens the door to more relationships.
2. Gratitude improves physical health.
3. Gratitude improves psychological health. 
4. Gratitude enhances empathy and reduces aggression.
5. Grateful people sleep better.
6. Gratitude improves self-esteem.
7. Gratitude increases mental strength.

http://www.forbes.com/sites/amymorin/2014/11/23/7-scientifically-proven-benefits-of-gratitude-that-will-motivate-you-to-give-thanks-year-round/2/