This will not be an ad for Ozempic. Nor will it be a jeremiad against the drug. My cardiologist told me a story about GLP-1 and the gila monster. (Yes at a certain age, you suddenly have a "my cardiologist.” Mine is a grandfatherly story-spinner.) Three to four extensive meals in spring are claimed to supply a gila monster with enough energy for a whole season. Scientists wondered why, which is what scientists do. What they also do is investigate.

.What they found was a hormone in the venom of t...