"Women fared a little better, at five times more likely to be underweight.The same region of 28 genes is associated with brain disorders such as autism, which may be linked to a deletion of the region, and schizophrenia, which may be linked to duplications.QUIZ: Are You a Fat Talker?As of now, it is unclear which gene or genes out of the 28 relate directly to BMI (it???s also premature to guess whe" . . . .