Chye Isuel:
cast iron stomach cuts your cost of living by 75%, but anyone watching you eat, reacts at you -3, because you're basically eating garbage, right?
You
can eat garbage, but that doesn't mean you must, or always do. With Cast Iron Stomach, you can also eat the hottest chili or curry, the slimiest
lutefisk, the stinkiest limburger (or other super-ripe cheese), the greasiest sausage -- or actual garbage, including what normal people would consider spoiled food (stinky meat, moldy cheese or bread, wormy fruit, curdled milk) -- without the slightest digestive discomfort.
If I were GM, I would only apply that reaction penalty if someone saw you eating something they considered disgusting or inedible. If they see you eating what they normally eat, they wouldn't have any hint you have the Cast Iron Stomach advantage, would they?