UC San Diego Smart Ring Tracks Glucose Through Your Sweat

Imagine monitoring your blood sugar, ketones, and four other vital health markers without a single needle prick or drop of blood.

Engineers at the University of California San Diego just made that reality with a new smart ring that reads the chemistry of your sweat. Using a clever osmosis technique with a special hydrogel, the ring continuously tracks alcohol, glucose, ketones, lactate, vitamin C, and uric acid levels, then sends all that data straight to your smartphone.

Here's the game changer: you don't need to work up a sweat for it to work. Unlike earlier sweat-monitoring devices, this ring extracts tiny amounts of perspiration naturally through the skin, meaning it works while you're sitting at your desk, sleeping, or just going about your day.

"Commercial rings only provide biophysical information, but they lack molecular information about biochemical markers that offers deeper insights about an individual's health status," says postdoctoral researcher Tamoghna Saha, who co-led the project with team members in Professor Joseph Wang's laboratory.

For people managing diabetes, the ring offers something particularly valuable: it tracks both glucose and ketones simultaneously. That's information that normally requires two separate devices, and it could help users make better decisions about insulin dosing in real time.

In testing, the smart ring performed just as well as the continuous glucose monitors that people with type 1 diabetes rely on daily. It also matched the accuracy of commercial blood ketone meters, but without any of the finger pricks.

The device calibrates to each user's unique biological factors and stays accurate for two months. It can monitor continuously for 12 hours before needing attention, making it truly set-it-and-forget-it technology.

The Bright Side

Beyond the impressive technology, this ring addresses something researchers know matters deeply: medical discreetness. Many people avoid checking their health markers in public because of the stigma around visible medical devices. A simple ring changes that equation completely.

For people who work desk jobs, have limited mobility, or simply want continuous monitoring without interrupting their lives, this represents a genuine leap forward. The team's work, published in Nature Communications, moves wearable health tech from tracking steps and heart rate into the realm of real-time body chemistry.

One ring could soon replace multiple monitors, eliminate countless needle pricks, and give millions of people the freedom to manage their health without anyone noticing.