I read an article about gardening being a great source of anti depression. Not only the activity, but also the bacterias in the soil, which we are deprived of in our modern society with it's hygiene and antibiotics. These bacterias lived with us for a very long time (thousands of years) and just recently we started to kill them in us. Additionally there are connections between the gut microbiome and the brain which are not fully explored yet.

I was sitting on a small hill in the grass and was feeling depressed like the weeks and months before that. I figured, a little bit of dirt couldn't hurt. I licked my finger, stuck it in the sand, and ate it.

This is of course anecdotally, but I'm certain it helped me.