Abstract: An oral weight control apparatus and method adapted to block solid foods from entering the stomach of a user thereof, while at the same time allowing the user to freely move his tongue and jaws, to talk, to breathe, to drink fluids, and to participate in other desirable activities without the presence of the apparatus being visible or otherwise made known to anyone other than the user. The apparatus includes a guard, net, or other sieve-like blocking means that is secured inside the mouth of the user. Liquids and finely ground foods may freely pass through the guard or sieve but solid foods may not. In the preferred embodiment, the blocking means functions as a one-way valve, blocking solid foods from entering the stomach through the mouth but allowing food within the stomach to pass back out through the mouth (as would occur, for example, during regurgitation).