[jfengel]

The rule for fresh bread varies from state to state because it's not considered interstate commerce, so it doesn't have to follow the federal labeling law. (There's a ton of hypocrisy about the use of the interstate commerce clause, but this part isn't completely stupid.)

It goes for all good produced and consumed in the same state, not just bread. Tobacco and alcohol actually are regulated federally even when produced in the same state (that interstate commerce hypocrisy I mentioned). They don't require ingredients lists but they do require licensing.

Where I live (Maryland), cottage industries have to include ingredients lists. Others require just allergens. Some have no regulations one way or the other.