But it's not about what rights are delineated, it's about what the government is allowed to do, and prevent the people from doing. If tuna fish were found to cause disease, then the government would have the duty to prevent its sale, and it does inspect food. The government does inspect and regulate roller coasters. And if someone were forcing me to eat tuna or ride a coaster against my will, the government would be getting onvolved in that, too.
(personally, I have no problem with the government making it illegal to cook fish in a microwave in a public place. Yecch.)