Although we are currently experiencing the highest living standards in the history of mankind:
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According to the existential psychologist, Rollo May:
It is a phenomenon discussed by Carl Jung and is characterized by the absurdity and emptiness of our lives, in the absence of any visible clinical symptoms. And it is all related to the "comfort" of the era we live in.
Possible causes: having more time to overthink; the lack of meaning in our lives and the difficulty of finding our true essence; we are disconnected from nature; we look for outside heroes and lack the ability to take responsibility.
The idea behind BAT is that we have to do happy to feel happy. Instead of our mood changing what we do, we need to change what we do to fix our mood. The first principle of BAT is to change what you do. Engage in the right activities and positive feelings will follow.
We can't wait until we feel better before we act. Emotions perpetuate themselves. We have to move now and break the cycle of our feelings. This is how we grab hold of happiness.