From the "Science for Raising Happy Kids"
Researchers have found that people who practice gratitude feel considerably happier (25%) than those in a control group; they are more joyful, enthusiastic, interested, and determined.
Grateful people not only feel good, but they act good, so to speak; their joy and enthusiasm is palpable to others. Studies show that people who have been taught to practice being appreciative offer more emotional support to other people. Grateful people are more likely to be both kind and helpful. And the spouses and friends of gratitude practicers report increases in energy, excitement, and attentiveness.