I Tracked My Glucose Levels With My Favorite Fitness Tracker. These 3 Takeaways Surprised Me

As a wellness editor and writer, I’m constantly experimenting with the latest health tech, so I was naturally intrigued when I learned that Oura Ring partnered with Dexcom’s Stelo, a continuous glucose monitor designed for people without diabetes. The goal of this collaboration is to help everyday people like me understand how food and general eating habits impact blood sugar and overall health. 

“By combining Stelo data with Oura’s existing insights, we’re empowering members to better understand the cause-and-effect relationships between eating patterns, energy, mood and recovery — and ultimately make sustainable, science-backed lifestyle changes,” Maz Brumand, vice president of product for Oura, told CNET.

I’ve used my Oura ring daily for the past three years to track my sleep, recovery and stress. But it was the first time I heard that a fitness tracker can monitor blood sugar levels. I tested the Stelo CGM with my Oura Ring for two weeks, and I can say that it changed the way I eat and move, and I think this type of biofeedback is helpful for everyone, even if you do not have diabetes.

What is continuous glucose monitoring, and why is it important?

Your blood sugar, or blood glucose, refers to the measurement of sugar in your blood. According to the Cleveland Clinic, glucose is the main source of energy for your body — it’s what powers your muscles, brain and even your cells. When you eat certain foods (particularly carbohydrates), your glucose rises, and your body responds by releasing insulin to shuttle that sugar into cells for energy or storage. On the flip side, if you experience frequent spikes or crashes (even if you don’t have diabetes ), it can impact your energy, sleep, mood and even long-term metabolic health. When your body doesn’t need glucose immediately, it stores it as glycogen in your muscles and liver.

For people with diabetes, monitoring glucose levels is crucial. But is it important to do the same for the rest of us without a diagnosis? To an extent, I think so. Monitoring your blood sugar throughout the day and seeing how your body reacts to different foods can reveal a lot about your cravings, sleep and metabolic health. “Glucose is a real-time window into metabolic health, which underpins how we feel day to day — our energy, focus, mood and sleep — and how resilient we are over time,” Brumand says.

With the rise of wearable glucose sensors like Stelo, those without diabetes can now get insights into how their eating habits impact their bodies (without finger pricks or a prescription).

What is a ‘normal’ glucose range, and are spikes bad?

Before using a CGM, I thought blood sugar was either stable or erratic, with no room for in-between spikes. Once I began tracking my glucose daily, I quickly learned that spikes are completely normal, especially after meals and snacks.

Most people will see glucose levels rise and drop throughout the day. According to the American Diabetes Association, a general target range for adults without pre-diabetes or diabetes is between 70 and 140mg/dL (note that Oura also follows this range, and it’s what users can expect to see in their graphs). It’s also worth highlighting that 70 to 100mg/dL is considered normal for fasting (particularly in the morning before having food), and under 140 mg/dL is common, especially after meals.

“Clinical studies show that even in healthy individuals, a moderate glucose spike (rise above 140mg/dL) can occur on a daily basis. In fact, research suggests that healthy adults will live above 140mg/dL for about 30 minutes, up to 2 hours a day, which is usually 1 to 3 short-lived glucose spikes”, says Renee Fitton, registered dietitian and director of education at L-Nutra, a nutrition technology company.

Fitton further explained that the number and frequency of glucose spikes depend on various factors, primarily what and when you’re eating. These spiked can also be affected by other factors like stress level, exercise, dehydration and even whether you have a sunburn.

Many glucose monitors use a custom range that adapts to your body’s baseline and patterns over time. When looking at your graph, it’s important to keep in mind that context and trends matter more than one-off spikes. For example, seeing a spike after dessert isn’t a sign that something is wrong. It’s a sign that your body is doing its job. What matters most is how quickly your glucose returns to baseline and how often your levels stay elevated over time.

“I would not see signs for concern for occasional (one to three times per day) moderate spikes (less than 160mg/dL) that resolve within about 30 mins. When reaching more frequent, especially if they are higher spikes (for example, above 180mg/dL), that take a long time to resolve (over 60 minutes), then there may be concerns about metabolic health,” Fitton explained. “A completely flat glucose curve is not something that we aim for; you want some gentle ups and downs as a sign of healthy metabolic flexibility.”

How I set up the Stelo monitor with my Oura Ring

You can order the Stelo sensor through ouraring.com ($99 for two sensors). I received a small box with the sensors and easy instructions. Applying it to the back of my upper arm took less than 2 minutes and was surprisingly painless. And yes, there is a small needle involved. I’m terrified of needles, so I spent some time mentally preparing to prick myself, but to my disbelief, I didn’t feel it at all. The sound the ejector makes is pretty loud, though. I sometimes think the sound acted as a diversion to my brain, and that’s why I didn’t feel anything. But, nonetheless, it was a pretty pain-free experience. Once in place, I paired it to the Stelo app, and it automatically reflected within the Oura app. Each sensor tracks your glucose level 24/7 for up to 15 days.