Are there any references covering how much CO2 is generated by a realistic vegan/vegetarian diet? It would be easy to identify a theoretically low CO2 diet of

Are there any references covering how much CO2 is generated by a realistic vegan/vegetarian diet? It would be easy to identify a theoretically low CO2 diet of rice and beans which does not require refrigeration, can be dehydrated for transport, grown easily and dense in calories. However this is not the diet that I generally see vegetarians/vegans eating - or the diet I go for when I eat vegetarian. I’m suspicious that we look at extremely high quality vegetarian foods when we want to claim health benefits, and then low quality foods when we want to claim environmental efficiency.