> Depression can be caused by a chemical imbalance and no amount of exercise or talking about it will fix it.

This is a debatable. As far as I understand things: 'chemical imbalance' has no tests to confirm that's actually true, That's just a story they tell to relax people.

Which is orthogonal to the point that antidepressants can work for some people.

We don't know how depression works. It very well may be many little things dressed in a trench coat.

https://www.sciencedirect.com/science/article/pii/S266656032...

https://www.nature.com/articles/s41380-022-01661-0

https://www.neurocaregroup.com/news-insights/the-death-of-ch...