What the pattern shows: Across two countries, over 50 years, and across seven very different disease categories — neurological (ADHD), respiratory (asthma), metabolic (T2DM), musculoskeletal (arthritis), gastrointestinal (IBD), neuroinflammatory (MS), and cardiovascular (hypertension) — the correlation with rising insulin resistance is consistent, strong, and in some cases near-perfect. The lowest r value in this dataset is 0.83. In epidemiology, a correlation above 0.7 is considered strong. Every single condition in this series exceeds that threshold in both countries. This does not prove that insulin resistance causes these conditions individually — ecological correlation is not individual-level causation, and age, diagnostic expansion, and improved surveillance all contribute independently. But the pattern is there, it is consistent, and it demands explanation. The most plausible single mechanism connecting this breadth of conditions across this timescale is chronic systemic inflammation driven by hyperinsulinaemia.