how obesity can increase intelligence

8.8: health/cortisol confusion:
. I had thought that cortisol
was the source of greater success among the obese,
but now I'm thinking the relation is like this:
. adrenalin dips sugar which raises cortisol
that causes insulin resistance;
and then adding grain diet to that condition
raises insulin, which raises inteligence .
[ cortisol does raise blood sugar for the brain's benefit,
but I was confused at how
increases of this could both increase intelligence
and be the source of brain damage ] .