New Study Suggests Apple Watch Heart Rate Sensor Can Detect Early Signs of Diabetes

Cardiogram, a company that offers an app able to break down heart rate data collected by the Apple Watch, today shared the results of a new study that suggests the Apple Watch can be used to detect the signs of diabetes.

Cardiogram researchers teamed up with the University of California, San Francisco and used the Cardiogram DeepHeart neural network to determine that heart rate data collected from the Apple Watch was 85 percent accurate at distinguishing between people with diabetes and people without diabetes.

applewatchheartrate2
For the study, Cardiogram used more than 200 million sensor measurements from 14,011 participants using an Apple Watch or Android Wear device and the Cardiogram app, aggregating data that included heart rate, step count, and other activity.

Prediabetes is a condition that often goes unnoticed and undiagnosed because traditional methods of detection require glucose-sensing hardware. Detection via the Apple Watch and an AI-based algorithm like Cardiogram's DeepHeart has the potential to alert users that there's an issue so they can then follow up with a medical professional.

According to Cardiogram, its study is the first large-scale study that demonstrates how an ordinary heart rate sensor, like the one in the Apple Watch and other devices like the Fitbit, can detect early signs of diabetes. Because the pancreas is connected to the heart through the nervous system, the heart rate variability changes when a person begins experiencing diabetes symptoms.

Over the course of the last year, Cardiogram and UCSF have teamed up to do a lot of research into the potential for wrist-worn heart rate sensors to detect serious health conditions. Previous studies have shown the Apple Watch heart rate sensor's ability to detect conditions that include hypertension, sleep apnea, and atrial fibrillation.

While there's still a long way to go before research proves whether the Apple Watch can officially detect early health problems, Cardiogram plans to implement new features to incorporate DeepHeart directly into the Cardiogram app in the future, which will allow users to be alerted if early signs of disease are detected.

Apple has also launched its own study in partnership with Stanford to determine whether the heart rate sensor in the Apple Watch can be used to detect abnormal heart rhythms and common heart conditions.

You can sign up to participate in the Apple Heart Study by downloading and installing the Apple Heart Study app and wearing the Apple Watch on a regular basis. If the Apple Watch detects an irregular heart rhythm, you'll be contacted by researchers and may be asked to wear an ePatch monitor.

You can also participate in Cardiogram's studies by installing the Cardiogram app and signing up to join the mRhythm study.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

apple intelligence black

Report: Apple's AI Strategy Could Finally Pay Off in 2026

Tuesday December 30, 2025 9:01 am PST by
Apple's restrained artificial intelligence strategy may pay off in 2026 amid the arrival of a revamped Siri and concerns around the AI market "bubble" bursting, The Information argues. The speculative report notes that Apple has taken a restrained approach with AI innovations compared with peers such as OpenAI, Google, and Meta, which are investing hundreds of billions of dollars in data...
apple fitness 2026 1

Apple Teases 'Something Big' Coming Soon to Apple Fitness+

Tuesday December 30, 2025 2:11 pm PST by
The Apple Fitness+ Instagram account today teased that the service has "big plans" for 2026. In a video, several Apple Fitness+ trainers are shown holding up newspapers with headlines related to Apple Fitness+. What's Apple Fitness+ Planning for the New Year? Something Big is Coming to Apple Fitness+ The Countdown Begins. Apple Fitness+ 2026 is Almost Here 2026 Plans Still Under ...
maxresdefault

Hands-On With a Rough iPhone Fold Mockup

Monday December 29, 2025 10:55 am PST by
Apple is rumored to be introducing a foldable iPhone in September 2026, and since it will bring the biggest form factor change since the iPhone was introduced in 2007, curiosity about the design is high. A 3D designer created an iPhone Fold design based on rumors, and we printed it out to see how it compares to Apple's current iPhones. Subscribe to the MacRumors YouTube channel for more ...
maxresdefault

Where's the New Apple TV?

Monday December 22, 2025 11:30 am PST by
Apple hasn't updated the Apple TV 4K since 2022, and 2025 was supposed to be the year that we got a refresh. There were rumors suggesting Apple would release the new Apple TV before the end of 2025, but it looks like that's not going to happen now. Subscribe to the MacRumors YouTube channel for more videos. Bloomberg's Mark Gurman said several times across 2024 and 2025 that Apple would...
iphone 17 pro dark blue 1

iPhone 17 Pro and Pro Max Users Report Static Speaker Noise While Charging

Tuesday December 30, 2025 10:39 am PST by
iPhone 17 Pro and Pro Max owners are having trouble with the speakers of their devices, and have complained about a static or hissing noise that occurs when the iPhone is charging. There are multiple discussions about the issue on Reddit, the MacRumors forums, and Apple's Support Community, where affected users say there is a noticeable static noise "like an old radio." Some people report...
iPhone Top Left Hole Punch Face ID Feature Purple

iPhone 18 Pro Launching Next Year With These 12 New Features

Tuesday December 23, 2025 8:36 am PST by
While the iPhone 18 Pro and iPhone 18 Pro Max are not expected to launch for another nine months, there are already plenty of rumors about the devices. Below, we have recapped 12 features rumored for the iPhone 18 Pro models. The same overall design is expected, with 6.3-inch and 6.9-inch display sizes, and a "plateau" housing three rear cameras Under-screen Face ID Front camera in...
iOS 26

iOS 26.2 Adds These 8 New Features to Your iPhone

Monday December 22, 2025 8:47 am PST by
Earlier this month, Apple released iOS 26.2, following more than a month of beta testing. It is a big update, with many new features and changes for iPhones. iOS 26.2 adds a Liquid Glass slider for the Lock Screen's clock, offline lyrics in Apple Music, and more. Below, we have highlighted a total of eight new features. Liquid Glass Slider on Lock Screen A new slider in the Lock...
samsung glitter blue

Samsung's Year End Sale Introduces Major Discounts on Popular Monitors and TVs

Monday December 29, 2025 6:29 am PST by
Samsung kicked off a new end-of-the-year sale this week, introducing great deals on monitors, TVs, Galaxy smartphones, and home appliances. Many of these deals are the exact same all-time low prices we tracked during Black Friday and Cyber Monday. Note: MacRumors is an affiliate partner with Samsung. When you click a link and make a purchase, we may receive a small payment, which helps us keep ...

Top Rated Comments

Herky68 Avatar
103 months ago
I believe that many of you don't understand just how much effort and expense apple has spent on developing this research program. I signed up late last year, and several weeks ago they notified me that they had read an irregular heart rhythm on my app. I called them, talked to a Dr. on line, they sent me a state of the art medical monitor the size of an Apple watch which is applied with a sticky tape over my heart for 7 days, I kept it attached for a week, sent it back (post payed) and they contacted me within 3 days, they had me contact one of their research Drs. who went over the results of the week long monitor, they saw no further arrhythmia , and gave me confidence that the earlier abnormal pattern was not a problem , readings showed my heart strong, and healthy. My heart has a minor abnormal pattern that I have known about for 45 years, and I've had numerous heart evaluations required by my employers. I have worn a Holter Monitor numerous times, it's bulky , hard to sleep with, and only records a day or two, the device that Apple sent me totally blew me away, light, you can shower with it on, and records on an internal chip an entire week of heart activity. Please give Apple the respect they deserve for truly using their research budget to start the next generation of wearable health monitors. Yes, I'm a Fan.
Score: 21 Votes (Like | Disagree)
coolfactor Avatar
103 months ago
Or you could have your doctor test your blood sugar every few months or whenever, thereby catching pre-diabetes early enough to perhaps prevent the full blown thing.
Or you could do both. It's not about choosing one or the other, but integrating daily monitoring into one's life without any additional inconveniences.
Score: 19 Votes (Like | Disagree)
BigMcGuire Avatar
103 months ago
Just signed up for the app and study. Kinda cool how it shows your stats versus other people your age. Also signed up for the heart study. I’m in the Apple Heart Study as well. Hope it helps someone.
Score: 8 Votes (Like | Disagree)
Apple_Robert Avatar
103 months ago
Like Big Mac, I just signed up and am now in both studies. I am all for being a lab rat if it can help me or someone else.
Score: 7 Votes (Like | Disagree)
ghanwani Avatar
103 months ago
So, um, will it tell me if I need to eat less meat? Eat more veggies? Drink better beer? Drink more water? Screw better chicks? :eek:

This kind of stuff is approaching clairvoyant...
It won't tell you what to do. It will tell your insurance company what you've been doing...
Score: 5 Votes (Like | Disagree)
OldSchoolMacGuy Avatar
103 months ago
Who “believed” that? Unless Apple said an oximeter was under development, why should anyone take issue with that not being available three generations later?
Some people don't understand what they word "rumor" means. They take everything printed on the internet to be fact and then get mad when it doesn't come true.
Score: 4 Votes (Like | Disagree)