From greatergood.berkeley.edu:

  
We’ve studied more than one thousand people, from ages eight to 80, and found that people who practice gratitude consistently report a host of benefits:

–Physical–

• Stronger immune systems
• Less bothered by aches and pains
• Lower blood pressure
• Exercise more and take better care of their health
• Sleep longer and feel more refreshed upon waking

–Psychological–

• Higher levels of positive emotions
• More alert, alive, and awake
• More joy and pleasure
• More optimism and happiness

–Social–

• More helpful, generous, and compassionate
• More forgiving
• More outgoing
• Feel less lonely and isolated.

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“Indeed, this ...