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I just came across this interesting chart, but I wasn't entirely convinced it was 100% accurate.
Here is the response from the free version of ChatGPT; it would be interesting to see the responses from other LLMs for comparison.
In 100 words, tell me which 
countries have a national law 
making it illegal for public 
institutions not to include a 
vegetarian meal option on 
their menu?
gemini free version:
The country with a national law making it illegal for all public institutions not to include a vegetarian—specifically vegan—meal option on their menu is Portugal.
In 2017, Portugal passed Law No. 11/2017, which mandates at least one "strict vegetarian" (defined as vegan) option in the daily menus of public canteens, including schools, universities, hospitals, and prisons. This measure was the result of a petition championed by the Portuguese Vegetarian Society.
While other countries like France have laws requiring a weekly vegetarian meal in school canteens (under the Climate and Resilience law, building on the Egalim law), and several regions or institutions globally offer plant-based options, Portugal's national mandate for a daily vegan meal across all public sectors is unique.
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33 sats \ 2 replies \ @optimism 7h
Grok4
Country/RegionScopeRequirementYearNational?
PortugalAll public canteens (schools, universities, hospitals, prisons, etc.)Mandatory daily vegan option2017Yes
California (USA)State prisons & healthcare facilitiesVegan meal at every meal2018–2019No (state only)
TaiwanCultural norm, many optionsNone (voluntary)N/ANo
IndiaSome states restrict meat salesNone (no mandate for veg options)N/ANo
BrazilSchool canteen regulations (limits junk food)None for vegetarian/vegan2001+No
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Is Grok4 avoiding France? hahahaha
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33 sats \ 0 replies \ @optimism 7h
Probably
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ChatGPT team version:
As far as I know, the only country with a national law explicitly obliging public institutions to offer a vegetarian (strictly plant-based) meal option is Portugal. ProVeg International +2 NYC Food Policy Center (Hunter College)+2
Other countries — such as France and Israel — require occasional meat-free meals in school canteens (e.g. at least one per week) rather than a mandatory vegetarian/vegan option at every institution. Wikipedia +1
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