The document provides 7 things not to do after a meal: 1) smoke, as it is equivalent to smoking 10 cigarettes and increases cancer risk; 2) eat fruits immediately, as it can cause bloating - have fruits 1-2 hours before or after; 3) drink tea, as tea contains acid that can harden proteins and impair digestion; 4) loosen your belt, as it can cause intestinal problems; 5) bathe, as it decreases blood flow to the stomach and weakens digestion; 6) walk immediately, as it can impair nutrient absorption - wait at least an hour; 7) sleep immediately, as food won't digest properly and can lead to gastrointestinal issues.