[fmxda]

I support this over a ban of trans fats as well, but

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If being trans-fat free was important enough to consumers then restaurants would publish that fact on their own.

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I don't think it is about legislating the desires of consumers, it's probably more about protecting (nannying as you say) people ignorant of the health risks of trans fats as well as possibly some externality considerations regarding health care.

But the certificate legislation is much better considering it has a demand-pull aspect with a thought-provoking sign over an invisible ban, as well as a supply-push incentive for restaurants to comply.