Climate variability and change contribute to food insecurity that can lead to malnutrition, including undernutrition, overweight and obesity, and to disease susceptibility, particularly in low- and middle-income countries . Since AR5, analyses of the links between climate change and food expanded beyond undernutrition to include the impacts of climate change on a wider set of diet- and weight- related risk factors and their impacts on NCDs, along with the role of dietary choices for GHG emissions  including dietary inadequacy , infections and sociocultural factors . Undernutrition exists when a combination of insufficient food intake, health, and care conditions results in one or more of the following: underweight for age, short for age , thin for height , or functionally deficient in vitamins and/ or minerals . Food insecurity and poor access to nutrient-dense food contribute not only to undernutrition but also to obesity and susceptibility to NCDs in low- and middle-income countries .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report