The beta (β) of a stock is the relative change in value of that stock versus the change of the stock market as a whole. By definition, the stock market has a beta of 1. It is a measure of volatility.
I believe mental health also has a beta. And it’s different for everyone. When you mental beta is high, it means your mental health fluctuates more than when it’s low.
Just like stocks you might end up at a higher level over the long run, but there can be a lot of volatility involved to get there.