Final answer:
Regional politics is not considered a major global health issue, whereas infectious diseases, obesity and diet-related diseases, and mental health are recognized as significant global health challenges.
Step-by-step explanation:
The option that is NOT considered a major global health issue is d) Regional politics. Major global health issues typically refer to widespread health problems such as infectious diseases, obesity and diet-related diseases, and mental health issues. Each of these represent significant challenges to public health across the globe. In contrast, regional politics may influence health outcomes, but it is not itself classified as a health issue.
For instance, many deaths in high-income nations are linked to cancer, obesity, and mental illness, rather than to a lack of clean water, which is a more prevalent issue in low-income countries. Social epidemiology, which is the study of the causes and distribution of diseases, shows that high-income nations deal more with diseases linked to obesity, such as heart disease, diabetes, and musculoskeletal disorders, underscoring the recognition of obesity as a major global health challenge.