Is oatmeal etible if tastes sour?

If oatmeal tastes sour, it may indicate that it has gone bad due to bacterial growth or fermentation. Consuming spoiled oatmeal can pose health risks, so it's best to err on the side of caution and not eat it. Always check for other signs of spoilage, such as an unusual odor or mold, before deciding to consume any food. If in doubt, it's safer to discard it.