Acceptance and Commitment Therapy (ACT, pronounced "act") not only helped me with generalized anxiety (which I no longer suffer from), but it also opened the door to fascinating research that I have been reading about ever since.

It is transdiagnostic because it exploits the fundamental building blocks and processes of cognition. In other words, it helps everyone who has mental health problems, as long as they are verbal (so nonverbal autistic people may require other therapy).

It is also 'superdiagnostic', because it improves peoples lives regardless of whether they are diagnosed with a mental health disorder.

Anyone who wants to have more flexible cognition and change their behavior, all with an empirically validated approach, could benefit from ACT.