Likewise, neither is there isn't a reason to believe that it is false. Again, I think we can agree on that.
My presumption here is the attempted discovery of truth, i.e. "the way things work", including the human body. Since the Enlightenment, the primary method for discovery truth, again "the way things work", was/is the scientific method. This is the route that is most likely to lead to the discovery of truth. Now, someone could argue that, "you can scientifically prove the existence of love" or some other such argument. There is controversey there I am sure.
But something like medical practice must be based on science. If it's not based on science and verifiability, there would be no progress in the treatment of various conditions, including those of a mental nature. I guess the question is: do you reject science in your pursuit of truth? If yes, then I guess I don't have much more to say.