A depressed person's dopamine, endorphins, oxytocin and serotonin are often depleted. Dopamine motivates committed action toward goals and gives us a surge of pleasure when achieving them, so taking on a new challenge and rewarding each steps helps to produce this neurotransmitter. Serotonin releases when you feel important- most antidepressant meds boost serotonin you can help your brain release this chemical by reflecting on your accomplishments or practicing gratitude. Oxytocin creates bonding and attachment- this suffers when people are isolated or lonely. Touch releases this chemical- so 8 hugs a day can help keep depression away. Endorphins support feeling euphoric and when they are low, people feel more pain and down. Running and laughing boost this neurotransmitter.
Ginseng, dark chocolate, hot peppers all help to release your happy chemicals.