On 29 August 2019, in an interview with Sky News, Professor Sir Ian Boyd, retiring Chief Scientific Adviser at the Department for Environment, Food and Rural Affairs (Defra), commented on the question of whether imports of chlorinated chicken and beef reared with artificial hormones should be allowed into the UK. He said that these were matters that should be decided by ‘consumer choice’. This briefing explains why the issues he raised – analysed in depth in previous FRC Brexit Briefings – are highly contested and sensitive; why we would be concerned if the UK allowed these products in under new post-Brexit trade deals, such as the one mooted with the US; and why Defra and other bodies such as the Food Standards Agency, which are supposed to protect consumers, should not duck the issues by saying this can be left to ‘consumer choice’. Opening up British markets to US-produced meats and vegetables is far more than a concern about animal welfare; it implies significant risks to public health and a radical decline in food quality standards which would be unprecedented and unacceptable in the UK. This must be prevented by robust commitments, which should be included in all legal agreements in any post-Brexit trade-related negotiations.