It is obvious. The prevalence of diabetes and high blood pressure varies by neighbourhood in Toronto. The following maps from Ontario Community Health Profile Partnership (OCHPP) website display this geographical disparity. The maps use a colour scale; the darker the area higher the rate. We can find a clear geographical…

Those who know public health know Prof. Irving Zola‘s “upstream vs downstream” parable. Irving Zola is a medical sociologist. His friend, John McKinlay, describes Zola’s parable in his 2019 article titled “A case for re-focusing upstream: The political economy of illness”1. The “Upstream boat” sails through this upstream path. Following…