In an appalling extension of the nanny state, New York is slated to become the first city to monitor diabetics' blood-sugar levels. It plans to register them like HIV or tuberculosis sufferers and nag them when their levels aren't healthy enough. Drop the cupcake; here come the sugar police. Sensible people will laugh at this, but New York City Health Commissioner Thomas Frieden, an appointee of Mayor Michael Bloomberg, is dead serious about the Big Apple's sweet tooth. He's the man behind New York's onerous smoking ban; he doesn't shy from alleging "epidemics." Since Mr. Frieden recently told the New...