What are the potential environmental impacts of shifting diets and what are the implications for policy? The first policy brief from The Food, Agriculture, Biodiversity, Land-Use, and Energy (FABLE) Consortium, hosted by SDSN and the Food and Land-Use Coalition (FOLU) addresses these questions. The analysis examines the implications of healthier dietary shifts on greenhouse gas (GHG) emissions, deforestation, and agricultural production and trade, should these shifts take place.