Here in Alabama we have the Chestnut Oak. They produce large acorns 1 to 1 1/2 inchs long. Boiling in one, or at most 2 changes of water gets all the tannin out. There is a common type of Red Oak, with very small nuts. You can boil these babys all day and they will still be bitter. Even the deer seem to leave them alone.

Any ill effects from eating any acorn comes only from the tannic acid in the nuts, boil or leach this out, and you can eat them till you pop :-)

Dean