I have been walking a lot. And also making sure to not eat sweet after 6. This has helped a lot. But as we age the depression is as natural as tea.And that chemical kind of keeps us in a loop of draining. Only way I feel fighting this is having a pet to distract us because they seem to make us move. Anything that makes us move should be around us. I have yet to touch 40 but in a year I will and then I feel exercise is even more important.