Perhaps few of them believe mental illness is the precursor to autoimmune diseases.
Stress first makes you crazy; then later it attacks an organ. Later, you die.
Sitting on your ass in Zen meditation may not reduce stress, but it would go a long way to reducing physical and mental illness, autoimmune disease, and death.
N-acetylcysteine: Potent Influenza Protection: http://www.lef.org/magazine/mag2010/may2010_N-Acetyl-Cysteine_01.htm
Complexity of schizophrenia: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3505861/