Yesterday while being very active (yard work), I got low, ate carbs, waited a bit to resume my work, and then got low a second time (didn’t expect that second one, due to having eating a good deal of carbs, and not much IOB remaining) about an hour later. Both times, the Dexcom alerted me in time to avert punishing, awful lows.
Today, again, doing yard work, I got an early warning from the Dexcom, so I came inside and had carbs.
Kudos to Dexcom for making an accurate, heath-improving device. I should have gotten one long ago!!