2. It Lasts Longer Than You Think
The same study by researchers at Berkeley also found the effects of gratitude lasted far longer than initially expected. Not only did the participants report better mental health up to 12 weeks after having written the letters, but three months after the completion of the study those who had written letters of gratitude were still riding high and processing things in a more positive way than those in the initial study who didn’t write the letters.

The researchers used an fMRI scanner to measure brain activity of the participants and found that people who are more grateful and aware of being grateful are also more aware of how they express and interpret gratitude. Basically, once you’ve embraced gratitude and realize how good it feels, you don’t want to let it go.