Changing dietary patterns, particularly reducing red meat consumption and increasing fruit and vegetable consumption, contributes to reduced GHG emissions as well as reduced premature deaths. The adoption of global dietary guidelines was estimated to prevent 5.1 million deaths per year relative to the reference scenario in which the largest number of avoidable deaths occurred in East Asia and South Asia, and GHG emissions would be reduced most in East Asia . In China, dietary shifts to meet national dietary reference intakes reduced the daily carbon footprint by 5-28% depending on the scenario . In India, the optimised healthy diets  could help reduce up to 30% water use per person for irrigation and reduce diet-related GHG emissions. This would result in 6800 life-years gained per 100,000 population in 2050 .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report