Not general curiosity -- but for healthier eating.
There's a theory that says you basically won't ever gain weight if you prevent your blood sugar from going above a certain level. So it's an objective way of knowing how much to eat and when.
Also, to warn when blood sugar is too low. Some people (myself included) often get so into work (or whatever) that we forget to eat, with adverse consequences. An alert is very helpful.
Usefull? It is if you use it. I do triathlons and knowing exactly where my blood-sugar level is at would allow me to focus better on the type of nutrition and the impact of it while working out.
It would also tell me if i was a bit down before a race, so i can take some food.
Basically: this is a game-changer for amateur athletes, which would create a tremendous market for it. People i know already use the patches to measure as well, or lactate measurements, ketone measurements, etc. and that's just at the casual amateur level.
Another application that springs to mind is knowing when to eat instead of just having lunch and sugar-crashing 2 hours later in the office.
That's what HelloLingo is selling. A wearable blood glucose monitor for 2 weeks, like diabetics wear, so non-diabetics can get a better feel for their blood sugar level and how what they do affects it. https://www.hellolingo.com
Would be a real game changer for endurance sports. There is "bonking" - depletion of muscle glycogen. When that happens your race is over. Sometimes it happens even to high level athletes what feels like out of the blue. If you knew ahead of time your blood sugar is getting low you could prevent it.
"If you knew ahead of time your blood sugar is getting low you could prevent it."
If I am connected to my body, I can also feel it by own biological sensors. But I do see the use case, to get another data input, for those cases where I am distracted and don't pay too much attention on myself.
Because it's built-in as an extra feature to a watch that you were already gonna buy. Garmin watches can measure blood oxygen, but not many people use the feature because it drains the battery quickly. Samsung watches can do a single lead EKGs. Does that sell you the watch? Probably not. Is it yet another thing a company can add to the spec sheet and use to justify a price increase? Yes.
I believe GP assumes the reader of their comment to understand that one of the types of diabetes is acquired during ones lifetime, by over-consumption of certain types of nutrition.
Preventing non-hereditary diabetes could be much cheaper from a societal perspective.
There is a whole spectrum from trying to reach ultimate form to trying not to die and everyone in between.
I measure my heart rate one time for fun. It was insanely high at rest. I felt perfect, full of energy but it was completely obvious i needed to introduce rest days. I conviscated the heart rate monitor and everything was back to normal 3 days later.