Source of data for split between national and international emissions from diet?

I’m doing a bit of analysis on the carbon footprint of diet. The sources vary wildly in terms of impact from diet. Some say meat accounts for 50% of global emissions where others say the total GHG emissions from food is around 20%.

I can find pretty good per person data and also emissions from agriculture in the U.K. but has anyone got a source of information which helps split national and international emissions data?

Not essential but would be helpful. Thanks in advance!