footprint for a meat eater is likely to be much larger than for a vegetarian;
production of meat requires a greater energy input than growing crops;
(meat eater is) eating at a higher trophic level;
means land is required to create feed for livestock and for raising livestock;
transport of meat for processing will increase the footprint size;
diet based on imported goods will lead to a bigger footprint / local goods will lead to a smaller footprint;
more fossil fuel consumed in process of transportation;
increase in material consumption for packaging;
greater (food) consumption will mean a bigger footprint;
more natural resources (land, fossil fuel, irrigation) required for meeting increased demand;