There's honestly a very simple recipe to combat about 85% of depression. The other 15% does require SSRI / therapy / etc.
- Clean up your sleep.
- Clean up your diet.
- Exercise, at full intensity, for 8-15 minutes a day. Weight training mixed in as well.
- Get sunlight or supplement with Vitamin D.
Yea, not sure why you are getting downvoted. Could anyone comment why downvotes? All sounds like reasonable advice (except that, of course, numbers like 85/15% is a bit handwavy, but I don't think author meant them to be precise).
- Clean up your sleep. - Clean up your diet. - Exercise, at full intensity, for 8-15 minutes a day. Weight training mixed in as well. - Get sunlight or supplement with Vitamin D.
Oh, and have great friends. That helps.