Some weight loss can be a normal part of aging usually due to shrinking muscle mass but it could be Gastrointestinal issues, which could lead to malnutrition or Hyperthyroidism and that can accelerate the body’s metabolism
You might have mold in your car try looking around on the floors for black mold
I feel Schizophrenia could be best treated with behaviourism.By this therapy the harmful behaviour due to psychological trauma of the patient could be avoided. Neurobiology would in no way be of help to these patients.This problem cannot be solved with a research on anatomy as it is a problem of mind. Counselling can help a lot.
A. Income level, because those with a lower income cannot afford more expensive fresh foods