Commentators and officials said Wednesday that the United Nations had cemented its position as a discredited global laughing stock after the UN “Food Envoy” criticized Canada — one of the wealthiest and healthiest nations in the world — for alleged inequality, poverty, and obesity. Critics of the global body and top Canadian policy makers promptly lambasted the organization for wasting scarce taxpayer resources “investigating” the nation and demanding reforms even as millions of people around the world starve. UN “Special Rapporteur on the Right to Food” Olivier De Schutter presented his demands for Canada in a dubious report released Wednesday...