Are they saying that controlling blood sugar reduces cancer, or that metformin controls blood sugar -and- reduces cancer through some other mechanism? There is

Are they saying that controlling blood sugar reduces cancer, or that metformin controls blood sugar -and- reduces cancer through some other mechanism? There is enormous evidence of health problems caused by high blood sugar. If this applies to cancer too, the actionable plan is to start measuring one's own blood sugar (either daily or with an implant which can do it continuously), and learn to control it. I'm ready to try this myself. Nothing beats direct measurement / "what gets measures gets fixed".