Plant-forward diets offer a potential solution to many of the health and ecological crises that we find ourselves facing today. A key barrier to the adoption and maintenance of plant-forward diets is an anticipated lack of support from family members, friends and romantic partners. The present study examined how relational climate (i.e., the cohesion and flexibility of a partnership) contributes to the tension individuals anticipate in their relationship when a member reduces their animal-product consumption, and their own openness to reducing. Four hundred and ninety-six coupled individuals took part in an online survey. Analyses revealed that couples with more flexible leadership styles anticipated less tension should they or their partner adopt a plant-forward diet. However, dimensions of relational climate were largely unrelated to openness to plant-forward diets. Romantic couples who perceived themselves to be matched in terms of dietary habits were less open to reducing their animal-product consumption than unmatched couples. Politically left-leaning couples and females were more open to plant-forward diets. The meat attachments of male partners were reported as a particular barrier to dietary goals, as were practical concerns about meal coordination, finance, and health. Implications for promoting plant-forward dietary transitions are discussed.