Day by day life is completely different once you’re monitoring glucose. Just a little over a 12 months in the past, I used to be on my method to a convention. My luggage have been packed, the Uber was on its method, however there was one very last thing to do earlier than I might head to the airport. Tearing open a small isopropyl alcohol wipe, I cleaned the pores and skin on the again of my arm. After that, I utilized a small applicator to the clear pores and skin, doing my finest to disregard the seen needle inside. I squeezed my eyes shut and pressed a button. It made a ka-thunk. I repeated the method on the opposite arm.
In my proper arm, I now had a Dexcom Stelo. Within the left, an Abbott Lingo. Each have been over-the-counter steady glucose displays (CGM) that will monitor the rise and fall of my glucose ranges. Opening my cellphone, I checked each the Dexcom and Abbott apps to ensure the CGMs have been transmitting knowledge. I made a psychological observe to examine how excessive altitudes may affect readings. It crossed my thoughts that, to my shock, I’d felt zero ache.
There was no pressing medical motive why I wanted to trace my glucose. I’m not a diabetic. My A1C ranges — the metric that measures long-term blood sugar — have all the time been good. However glucose monitoring isn’t only for diabetics anymore. On social media, you may see docs, wellness influencers, biohackers, and athletes speaking about CGM use. I simply occur to check well being tech, so I believed I’d give it a whirl for just a few weeks and see if there was any profit for a non-diabetic like myself utilizing this tech.
As a substitute, I ended up spending over a 12 months testing the gadgets, studying up on research, talking with researchers, and falling down rabbit holes. I bounced from physician to physician attempting to determine if there was truly one thing mistaken with me — or the gadgets I used to be utilizing.
Making use of CGMs has turn into second nature over the previous 12 months. They don’t damage, however I’m hyper conscious of the sorts of sleeves I put on whereas testing.
The primary “skilled use” CGM was cleared by the Meals and Drug Administration in 1999. Most individuals suppose these gadgets are used to trace blood sugar, however that’s not totally appropriate. Technically, they supply real-time glucose measurements from the interstitial fluid between your cells, simply beneath your pores and skin. In comparison with conventional finger-stick exams, which immediately measure blood sugar, CGMs can monitor glucose tendencies over an prolonged time period.
Till 2024, CGMs required a prescription and have been gadgets primarily utilized by Sort 1 diabetics — individuals who produce little to no insulin. Now, each Dexcom and Abbott promote CGMs focused at non-diabetics, prediabetics, and Sort 2 diabetics who don’t depend on insulin. To distinguish, generally you’ll see corporations market over-the-counter gadgets as “glucose biosensors.”
The advantages of utilizing CGMs for prediabetics and Sort 2 diabetics are clear. In contrast to Sort 1 diabetes, prediabetes and Sort 2 are likely to develop over time because the physique turns into extra proof against insulin. If caught early sufficient, it may be “reversed” with life-style interventions like modifications to weight loss program and train. Folks with pre- and Sort 2 diabetes additionally make up the overwhelming majority of circumstances within the US. Based on the American Diabetes Affiliation, as of 2021, Sort 2 diabetics make up about 95 % — or roughly 36 million — of the estimated 38.4 million Individuals with diabetes. In the meantime, about 98 million have been estimated to have prediabetes. Put all that collectively, and a major variety of individuals might probably study quite a bit from utilizing CGMs about how their dietary habits affect a reliable metabolic situation.
Much less clear is whether or not this expertise is helpful for non-diabetics. However that hasn’t stopped the push for this tech, from each the CGM makers and the federal government. If Well being Secretary RFK Jr. has his method, in 4 years, everybody is perhaps sporting one in every of these. Underscoring this, President Donald Trump’s controversial surgeon common nominee Casey Means can be the cofounder of Ranges, a CGM startup geared toward non-diabetics. In her ebook Good Power, she calls out the expertise as a great tool in fixing metabolic dysfunction — one thing she claims is on the root of each doable continual ailment at present. Nevertheless, a number of medical consultants have publicly questioned this logic, stating the proof for non-diabetics merely isn’t there.
However we’ve now entered a brand new period the place wearable expertise affords a tantalizing promise. It’s not nearly flagging potential diseases. It’s about optimizing your physique’s biometric knowledge to reside the longest, healthiest life doable. Within the context of the US’s terribly flawed healthcare system, this tech has usually been positioned as giving again a level of management to the typical particular person. Put on this machine, monitor your well being, study extra about your self, and subsequently make higher selections.
Optimization of metabolic well being has been a rising pattern for years. Mostly, this has come within the type of meals logging. Nevertheless, CGM-related metabolism monitoring has gained traction as a result of further layer of knowledge it gives. January AI was initially a CGM startup that then pivoted to offering glucose spike prediction inside a meal logging app based mostly on the info it collected. In the meantime, Oura has since partnered with Dexcom to offer glucose readings, meal logging, and AI interpretations inside its personal good ring app. Abbott additionally not too long ago partnered with Withings, one other wearables maker, for the same integration. Whenever you consider that GLP-1 use is rising, alongside the return of 2000s-era, ultra-skinny weight loss program tradition, it looks as if CGM use is being positioned as the following evolution of health monitoring.
Why not strive biohacking my vitamin to handle my diabetes threat, achieve perception into PCOS, and be a greater athlete?
“It’s predicted one in two Individuals can have weight problems by the 12 months 2030,” says Dr. Thomas Grace, a diabetes clinician with Sort 1 diabetes who consulted with Dexcom on the Stelo CGM. “I feel probably the most thrilling factor for myself, for my sufferers, and for individuals utilizing Stelo is the moment reward they get from understanding how meals, exercise, stress, and sleep have an effect on their total glucose well being.”
I’m the precise form of non-diabetic that Dexcom, Abbott, and different CGM startups are focusing on. I’ve obtained a household historical past of Sort 2 diabetes and excessive ldl cholesterol. I’ve been identified with polycystic ovary syndrome (PCOS) — a continual situation that quite a few docs have instructed me means I possible both have insulin resistance or continual irritation that makes me predisposed to diabetes. As a runner, I’ve struggled with power ranges whereas coaching for long-distance races regardless of following normal fueling practices and carb loading. Why not strive biohacking my vitamin to handle my diabetes threat, achieve perception into PCOS, and be a greater athlete?
Even if you happen to apply a CGM completely, they will nonetheless fail for one motive or one other. The CGM pictured mysteriously failed after solely 48 hours of testing. This occurred just a few instances within the final 12 months of testing.
Sporting a CGM 24/7 is invisible till it isn’t. I went days with out remembering they have been in my arms. Then, they’d inevitably snag on my shirt sleeve, or I’d brush right into a doorframe, the contact popping the CGM out of my arm. Now, even once I don’t put on CGMs, I’m conscious of the again of my arms and the minimize of all my shirts. That hypervigilance comes with being continuously monitored — even if you happen to’re the one doing the monitoring.
At first, I’d evaluate my knowledge each morning, after every exercise, and some hours after every meal. Most of what I noticed was fairly regular. A bowl of pasta? Glucose spike. Roasted salmon and a aspect salad? Minimal enhance. Carb loading earlier than a long term? Mondo spike, adopted by a pointy lower. (I discovered CGM use too cumbersome for mid-run fueling, as there’s a five-minute delay between readings.)
Nonetheless, reviewing my knowledge a number of instances a day started spiking my nervousness. Each Dexcom and Abbott’s apps have academic articles about what the best glucose vary is for wholesome nondiabetics — 70 to 140mg/dL. Fasting glucose ranges — like once you’re sleeping — ought to sit down within the vary of 70 to 99mg/dL. These first few months, I awoke properly past 100mg/dL every single day, even with out late-night snacks. Generally, I’d get up to see the Dexcom app had alerted me to glucose spikes whereas I slept. (Abbott doesn’t ship spike notifications for Lingo.)
A 12 months prior, I had examined Nutrisense — which additionally makes use of CGMs — for 2 weeks and by no means had elevated morning glucose ranges. Clearly, diabetes had lastly come for me.
Elevated morning glucose is a priority due to the Daybreak Phenomenon. To assist put together your physique to get up, you produce hormones like cortisol and development hormone. That alerts to your liver to launch glucose, supplying you with power for the day. In diabetics and insulin-resistant individuals, nonetheless, it results in overly excessive blood sugar ranges throughout the morning. One thing, maybe, like what I used to be seeing.
I spent many mornings puzzling over excessive in a single day glucose readings and what that might presumably imply.
Cue nervousness, scheduling a flurry of docs’ appointments, and hyperfixating on my weight loss program and train. On the physician’s workplace, I obtained shrugs, quizzical forehead raises, and a reluctant acquiescence to run blood exams. (“Do they actually have non-diabetics sporting these?” a nurse requested whereas taking my blood strain.) My A1C, a gauge in your common glucose ranges over two to a few months, was completely regular. No diabetes right here. I did, nonetheless, have elevated liver enzymes and levels of cholesterol.
Out of an abundance of warning, my physician ordered an ultrasound. I needed to wait a number of weeks for an appointment. Later, as soon as the goo was slathered over my stomach, I watched nervously out of the nook of my eye as an ultrasound technician muttered to herself. After one other few days, I obtained a name from the physician. I used to be identified with a “nothing to fret about proper now” case of non-alcoholic fatty liver — a situation that generally happens alongside PCOS. Possibly, my physician prompt, I ought to minimize out all alcohol (I hardly ever drink) and lose physique fats (I’ve been attempting for 10 years). Come again in a couple of 12 months, they stated, and we’ll see the place you’re at.
Learn a technique, this might be a hit story for CGMs. The gadgets flagged one thing had modified, and although it wasn’t diabetes, I had at the least one new official analysis. Glass half full: Management over my well being had been handed again to me.
A extra skeptical take is that elevated liver enzymes and excessive ldl cholesterol had been current in earlier blood work. A former physician had additionally suspected fatty liver illness, however stated an ultrasound wasn’t needed until my ranges worsened. Had been my ranges worse at this CGM-inspired blood take a look at? Not significantly. The recommendation I’d been given was the identical because it had been in years previous. Glass half empty: I realized nothing new.
It wasn’t till a lot later, after consulting with Dexcom and Abbott, that I realized aspect sleeping might result in inaccurate in a single day glucose readings. Whenever you’re in your aspect, the CGM can get compressed. That, in flip, might result in readings decrease or greater than your precise glucose ranges. I attempted swapping arms for the Lingo and Stelo to check for this, but it surely was not possible to account for the way I shifted positions every night time. Both method, I continued getting excessive in a single day and morning glucose readings from each sensors for months.
The worst half was that I couldn’t inform whether or not the info was inaccurate or my physician had missed one thing.
I began working into points after the primary month of steady put on. For starters, it may be dear. Dexcom and Abbott each gave me a number of take a look at items, however for the typical particular person, it may value round $100 a month. A single sensor lasts about 15 days if every part goes properly. Generally, they malfunction or get ripped out after getting caught on clothes and different objects. The adhesive additionally leaves cussed residue that takes weeks of showering to completely take away. Partly to stretch out my provide, partly to provide my pores and skin a break, I began testing two weeks of each month. After six months, I pared all the way down to as soon as 1 / 4.
However no matter how usually an individual makes use of CGMs, each physique is completely different. Meals that trigger a spike for me could do nothing for you. The one method to know for certain is thru diligent logging and experimentation. The conundrum is that this creates a mountain of knowledge, and as I realized, decoding that knowledge with out ample context can result in pointless nervousness.
Compounding the problem? CGM makers have differing approaches on learn how to current that knowledge. The Dexcom Stelo app, for instance, provides you with spike alerts after about an hour or two. Abbott’s Lingo CGM eschews such alerts altogether. As a substitute, Abbott opts for a Lingo Rating that tries to simplify uncooked knowledge right into a digestible quantity that signifies how properly you probably did on common at maintaining your glucose inside a wholesome vary of 70 to 140mg/dL.
Should you put on two CGMs concurrently, as I did, it’s doable to get completely different numbers and never know which one is actually appropriate
Utilizing a CGM to remain inside that vary sounds comparatively easy and simple. In actuality, it’s difficult.
“The one research that did take a look at follow-up outcomes discovered that individuals who spent extra time above that vary have been extra prone to get diabetes, however this was in a reasonably small inhabitants,” says Nicole Spartano, assistant professor at Boston College’s Chobanian and Avedisian College of Medication. “They might have already had prediabetes and are form of on their method already. I feel we’re actually at a degree the place we don’t have a variety of data from a analysis standpoint.”
For instance, Spartano notes that there’s usually a scarcity of context for the way CGM numbers might relate to a person’s well being. On the one hand, docs usually see a fasting blood glucose stage of over 100mg/dL as a trigger for concern. CGMs, nonetheless, don’t measure blood glucose. They measure interstitial glucose, which might, at instances, be greater than blood glucose. Spartano says extra analysis is required to find out what the variations between blood and interstitial glucose might be, each broadly and on a person stage.
My glucose has improved since beginning new treatment. Nevertheless, what precipitated these in a single day spikes? A foul dream? Aspect sleeping? Temperature shifts? I’ll by no means actually know. Screenshot: Abbott
“We assume that they’re fully correct, however they’re not precisely correct. There’s a sure stage of accuracy that the FDA requires, however that also leaves some wiggle room,” says Dr. David Klonoff, medical director on the Diabetes Analysis Institute at Mills-Peninsula Medical Middle and editor-in-chief of the Journal of Diabetes Science and Know-how.
Mainly, if you happen to put on two CGMs concurrently, as I did, it’s doable to get completely different numbers and never know which one is actually appropriate. And whereas most individuals would solely put on one by one, there is also a distinction between one CGM you put on and the following, based mostly on whether or not they have been utilized appropriately and several other different components.
However say every part is assumed to be correct. What’s one of the best ways to interpret CGM knowledge for non-diabetics? To try to discover out, Spartano ran a scientific research by which 18 endocrinologists have been requested to guage knowledge from non-diabetics.
“We gave them 20 completely different glucose monitor studies and requested them, ‘If somebody got here in with this report, would you recommend they’ve a follow-up screening for this?’” says Spartano. She says some consultants seen peaks as a traditional a part of physiology. Others noticed elevated ranges as an indication somebody may want additional testing.
“Primarily, there was no consensus. Even clinicians who learn CGM knowledge all day, every single day don’t know what to do with this knowledge,” says Spartano.
“One of many issues is we don’t have a great method of analyzing the knowledge but. We all know if somebody is doing actually poorly or fully usually, however the those that appear to be headed for bother? We will solely say, ‘It doesn’t look regular, but it surely’s not irregular. It’s one thing within the center,’” agrees Klonoff.
“Primarily, there was no consensus. Even clinicians who learn CGM knowledge all day, every single day don’t know what to do with this knowledge.”
Based on Klonoff and Spartano, there isn’t a reference set of knowledge that’s been vetted and agreed upon by a gaggle of consultants. The information that’s coming in from completely different subgroups of individuals utilizing over-the-counter CGMs is all so new that it’ll take years earlier than that’s even doable.
So, say you, a non-diabetic, wanted assist decoding your CGM knowledge. It’s very doable that if you happen to have been to current your knowledge to 10 completely different docs, you may get 10 completely different suggestions.
Throughout my analysis, a number of docs and diabetes consultants instructed me I used to be wonderful provided that my A1C remained optimum and my CGM knowledge — for probably the most half — stayed inside a wholesome vary. Spikes, they assured me, are a traditional a part of my metabolism functioning because it ought to.
Nevertheless, that’s technically not optimizing. Take Means. Whereas her credentials are questionable (she thinks you may forestall most cancers with “good power” habits), in her New York Instances bestseller Good Power, she advises, “We wish to decrease spikes as a result of they’re related to worse outcomes.” She advocates for stricter standards. Publish-meal glucose ranges shouldn’t rise above 115mg/dL, no spike needs to be above 30mg/dL, and “optimum” morning fasting glucose needs to be between 75 and 80mg/dL. I’ve seen different influencers suggest comparable recommendation, albeit with barely completely different numbers.
By these requirements, you might be in a wholesome vary 100% of the time however nonetheless have a “suboptimal” metabolism. By no means thoughts that consultants have stated there’s not sufficient consensus to outline what warrants “good” or “unhealthy” CGM knowledge in non-diabetics. Many CGM apps provides you with scores and extra metrics to intention for. Should you’re a perfectionist like me, that may be a recipe for catastrophe.
I experimented with protein bagels to see in the event that they’d decrease glucose spikes whereas giving me sufficient power for longer runs.
I began measuring each single little bit of meals I ate, together with this do-it-yourself protein jello.
Inspector Petey the cat was not a fan of my glucose experimentation during the last 12 months.
The longer I wore CGMs, the extra obsessed I turned with the meals on my plate. A slice of pizza at a gathering would make me get away in a chilly sweat. Frequent sense says a single slice of pizza now and again isn’t the tip of the world. However the considered a spike alert or a foul rating was sufficient to persuade me that I ought to forgo consuming meals or snacks totally, even when my abdomen was growling. Likewise, I started overexercising. I’d really feel good if my fasting glucose was under 85mg/dL, and confused if it was something over 100 — even when there was a logical, non permanent, good motive for that. I started to really feel confused about being confused. At a sure level, I turned incapable of having fun with social occasions and began avoiding them. The worst second got here early on in testing at a household Thanksgiving dinner. I began negotiating with myself about what I might eat based mostly on the way it was displaying up in a CGM app. After six months, it turned unhealthy sufficient that folks near me felt the necessity to intervene. I had been too fixated on efficiently “optimizing my metabolism” to note.
That is usually forgotten within the narrative to optimize metabolism. Research have discovered that it’s troublesome to conclude that wearables, weight loss program, or health apps have a definitive hyperlink to disordered consuming or consuming issues — although the chance is there, and so they have been related to exacerbating signs in those that have already got skilled them. For some individuals, CGM use gained’t include this sort of darkish aspect. For me, it completely did.
I now choose to make use of CGMs solely to check new options.
After a couple of 12 months, I made a decision to conduct one closing take a look at. As soon as once more, my knowledge was wonky. Morning glucose was elevated. Publish-meal spikes have been extended. And my each day common glucose was greater than it’d ever been. I used to be persistently exhausted. I saved gaining weight regardless of vigilantly monitoring my vitamin and train. I discovered a brand new physician and obtained some extra blood work completed. Nonetheless no diabetes or prediabetes. However my unhealthy ldl cholesterol had worsened, and two liver enzymes had greater than tripled from the earlier 12 months. An ultrasound confirmed my fatty liver had progressed from delicate to average. For the primary time, I had my insulin resistance examined and was discovered to be on the “excessive aspect of regular.”
My new physician concluded that my non-medicated efforts to rein in my chaotic metabolism, whereas admirable, weren’t reducing it. Prescriptions have been written, a plan was shaped, and 4 months into therapy, my CGM knowledge and blood work have dramatically improved. For the primary time in a decade, my unhealthy ldl cholesterol is regular. I’ve misplaced 15 of the 25 kilos I gained, and my liver enzymes have dropped by roughly 65 %. My morning glucose ranges are not elevated.
My biomarkers have dramatically improved due to new drugs, however the hardest factor to measure was how this affected my psychological well being.
Proponents of non-diabetic CGM use may body this as an outright win. In some ways, it’s. Even so, I’m hesitant to characterize it that method. I used to be usually stumped by my knowledge, anxious when consulting docs, and for a time, wrecked my hard-fought relationship with meals and train. General, it took 13 months from beginning CGM testing to discovering a passable therapy for my metabolic points and 17 months to lastly see enchancment. Alongside the best way, I shed many tears of frustration, and I’m nonetheless adjusting to the unwanted side effects of my new drugs.
I’m grateful to see my well being enhance. My long-term testing of CGMs undeniably performed a job in that. However arguably, treatment — not CGM use and positively not “taking management of my well being” via life-style modifications alone — is what’s in the end serving to me really feel higher. I’m all for non-diabetics getting access to these sensors, as long as they’re conscious of the constraints. What I’m not for is framing CGMs as a silver bullet for demystifying and optimizing your metabolism.
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