2. Serotonin

Serotonin flows when you feel significant or important. Reflecting on your past achievements allows your brain to re-live the experience. Your brain has trouble telling the difference between what is real and what is imagined, so it produces serotonin in both cases. Gratitude practices are popular for this reason, they are reminders -- mental pictures -- of all the good things you’ve experienced. If you need a serotonin boost during a stressful day, take a few moments to reflect on your past achievements and victories.