Anonymous wrote:Someone explain the to me. When you're hungry, you're blood sugar is low, so you need to eat. If you consume too much sugar but have a functioning pancreas, insulin keeps your blood glucose from going too high. So if anything, a CGM can tell you when you need to eat but not when you've eaten too much. It's unclear how it can help healthy people lose weight. Sounds like junk science to me.
Except them that a lot of overweight people have an impaired insulin response, and the details of it are an excellent thing to know about. Even if your A1C is normal, your insulin response can be abnormal. My two hour postprandial is totally normal, but my one hour is off the chain if I eat high carb. The point of a CGM is to tell you how your body responds to particular foods or behaviors. For example, oatmeal is a great low glycemic impact food for some: for others, like me, it causes a large glucose spike. on the other hand, I discovered that home-popped popcorn has very little impact - the combination of fiber, fat, and carbs seems to work well for me.
If someone were 100% sure that their insulin response was completely normal, then I guess the best one could hope for is that it would provide some kind of visualization/accountability for sticking to a diet. I certainly wouldn’t begrudge them that. And for those of us who do have impaired fasting glucose – which is common for overweight people – it is indubitably useful.