A.B.
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The problem I see is that it is pretty clear that harmful mental habits have negative effects on biology. This is pretty clear by now to doctors and researchers as well.
Name one study that can demonstrate that there is at least one illness caused by "harmful mental habits".
Of course you won't be able to find such a study. At best some brief and mild changes when people are subject to frightening images or the like. Nothing that would pass as actual illness.
It would also be educational for you to read some material from the 50's, where the idea that mental state was cause of illness was more popular. Illnesses considered psychosomatic were rheumatoid arthritis, autoimmune thyroid disease, multiple sclerosis, peptic ulcer, and many, many others. It is humbling to read this material because the researchers genuinely believed they could see personality flaws in these patients, and spent a lot of time and effort coming up with elaborate explanations for how these flaws translated into illness. It also makes you realize how much damage this thinking has done. People with real suffering were sent to the psychoanalyst. That included people with life threatening illnesses such as asthma.
Edit: here is the abstract of one such study written in 1951:
Twenty-five women with peptic ulcers were studied from the psychosomatic point of view. All exhibited profound and overt personality disorders. The majority had been rejected by the mother and turned to the father for support. Ulcer symptoms were precipitated when the supporting figure failed them. Oral aggressive feelings played an important role and were often equated with denial of femininity. This group of women with peptic ulcers had a much higher incidence of overt personality disturbances than the majority of a comparative group of men peptic ulcer patients previously studied, although frustration of dependent wishes was equally important in both groups. The shift in the sex ratio of peptic ulcer during the past 50 years suggests that cultural factors may play a role in the development of this disease.
http://journals.psychiatryonline.org/article.aspx?articleid=144588
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