Proverbs 25:16:

Hast thou found honey? eat so much as is sufficient for thee, lest thou be filled therewith, and vomit it.

See also:

God, Satan or You?
Objection: Paul Told Timothy to Drink Wine Instead of Believing God for Healing
Objection: As Many Doctors Can Tell You, Many People Make Themselves Sick – It Has Nothing to Do with the Devil