I’ve been a T1D for 30 years and used Dexcom for at least 5 years, but I’m about ready to quit using Dexcom. I’ve discovered a website that helps me predict blood sugars. It’s predictbgl.com or managebgl.com (either one) and it’s made a huge difference for me just this month.
For all the money I’ve put into Dexcom (and that my employer has paid for its share of the strips), I have lots of high and low blood sugars. In the few weeks I’ve used predictbgl.com, I’ve averaged about one a week? You can try it out free for a month. Then it’s $60 for 6 months. I’ll warn you that it takes work. You need to log your grams of carbs, protein, and fat, as well as your exercise, insulin doses, blood sugar readings (from finger sticks), and other factors (illness, stress, pain, alcohol, etc.). I’ve discovered that when I have eat out or have homemade soup, I can’t use predictbgl.com, but I use it for every meal I can. I can usually use it for breakfast and lunch, and it’s already given me level blood sugars for those time periods routinely.
You have to start out estimating how many grams of carbs are covered by a unit of insulin at different times of the day, and how many mg/dl a unit of insulin will lower you. There’s no way you’ll guess correctly to start, but there’s a “Coach” feature that suggests what you should change your estimate(s) to. It’s working for me better as I keep revising the estimates.
I’ve developed a spreadsheet that lists grams of carb/protein/fat per 100 grams of foods. predictbgl.com has a food database, but I haven’t tried to use it yet. I weigh my food, add up the grams of carb/protein/fat, and put them into the spreadsheet. The chart warns me when I’m going to go high or low (defined by what I tell it is high or low), and I can eat more or take a shot based on what the chart shows.
My A1C’s over the years have ranged from 5.0 to 6.1 (except for a 6.3 earlier in 2015), but every A1C has included at least a couple hundred low blood sugars that helped average down my high blood sugars. A few weeks of this program has given me real hope that I can keep both highs and lows down to one or two a week over the long term.
The app works best with Apple, but I don’t have that, but I’m getting by (well enough) with my HP computer and Samsung phone. I recommend that you try the website out for a while (as I did) before paying, to make sure that you’ll actually go to the work of weighing your food and working on revising your estimates as necessary. If you really want to avoid low (and high) blood sugars, I haven’t come across a better way. Dexcom doesn’t predict. (You can tell you’re going low, but you don’t know how low, nor do you know how much you should eat to come back up just enough.) And it’s expensive. And I understand that its new device (which I haven’t gotten) has planned transmitter obsolescence, to make sure you can’t milk extra time out of it the way you could with the G4. I have three more sensors to use, but I don’t plan to order more. One sensor costs more (before insurance kicks in) than a whole year of predictbgl.com.