only very rarely will I sit meditation with anything still inside my stomach. I time meditation so the stomach is totally empty (of any solid food) before I start. Practically speaking, that usually means just before either breakfast, lunch or dinner. Waking up early, having just rested adequately, helps also, as does washing one's face in cold water and going for a walk outside in the cool, fresh morning air, before you come back inside to sit meditation.
Then the Blessed One, picking up a tiny bit of dust with the tip of his fingernail, said to the monk, "There isn't even this much form...feeling...
perception...fabrications...consciousness that is constant, lasting, eternal, not subject to change, that will stay just as it is as long as eternity."