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The European Union's Green Deal proposal and Farm to Fork strategy call for both demand and supply measures to reduce emissions from the food system. While research clearly illustrates the importance of dietary transitions, impacts of potential supply-side measures are not well understood in relation to competitiveness concerns and leakage effects. This study assesses trade and GHG emission impacts of two supply-side mitigation strategies (intensification vs. extensification) in the EU, UK and Switzerland (EU+ 2), against a 2050 baseline featuring healthy/sustainable diets adopted by European consumers. To capture potential leakage effects arising from changing external trade flows, the two supply-side strategies are assessed against three trade policy regimes (ie status quo, regional trade liberalization with and without border carbon adjustment), resulting in six scenarios formulated with detailed inputs …