- We have too little to lose from giving EXERCISE, exposure to sunlight (Vitamin D), and healthy diet a fair chance to improve Happiness vs. Depression
People that suffer from depression don't feel like exercising or may not even feel motivated to do anything. They need a boost, external energy and that can come from the meds. Of course the exercise and the other stuff you mentioned may be helpful to prevent depression but once you have depression, a person should consider medical treatment for the chemical imbalance in the brain and psychotherapy.
—Too much exposure to sunlight may give you skin cancer or damage your skin.