Depression, schizophrenia, and anorexia are output states. They are not the underlying problem. When you start trying to fix the output state, the problem is that you are trying to alter the signal, even though the signal itself is working perfectly.
Another way of explaining this: if nobody had depression in the world we live in right now, there would really be something wrong. Depression itself is working exactly as it should. If my uncle, who has smoked his whole life and worked with poisonous paint, didn't develop COPD, I would be worried. The doctor should give him a badge: "You have a perfect body."
Sometimes it's hard to get out of the hamster wheel.
A hamster wheel can be something like this: you eat badly, and a few hours later you become unpleasantly hyper because of the energy that's released.
That's very hard to see when you're inside it, because you're used to the hamster wheel. You eat this and that, and a few hours later you behave in a certain way.
Or you spend half the day on social media, and all kinds of unpleasant thoughts keep running through your head. Part of that is because you're putting them there yourself through the news and social media. Your brain then has to process all that information later in the week.
You can spend your whole life in these kinds of hamster wheels without realizing what's happening. There are people who have spent their entire lives in a hamster wheel caused by certain food sensitivities without ever noticing it. Brutal, isn't it?
This is why we sometimes have to help each other. The problem with helping each other is that you also don't want to be too preachy. Every new rule about how to live that you give someone else also costs mental energy. I used to be able to eat a chocolate sprinkle sandwich without feeling guilty. Now I have to worry all day about what I put into my body. So it works both ways.