i base it on how much i eat, weight gain, and amount excreated. i spoke to a doctor and he confirmed that a heating patch over the abdominal area will definitely increase blood flow to the vital organs including the intestines. he said it may or may not increase absorbtion of food but increased blood flow to the vital organs cant be a bad thing.
and to swolecat: now that your finished laughing, do you have anything constructive to say?