Apple is about to release sleep apnea detection support for Apple Watch users with watchOS 11.1. However, that’s not the only health feature the company has been working on in the past year. According to Bloombergis Mark Gurmanthe company tested a blood sugar app to help people with prediabetes manage their food intake and make lifestyle changes.

This top secret project was held with selected employees with prediabetic diagnoses early this year. While Apple doesn’t plan to release this app to the public, it still wants to integrate this technology into future health products, including a non-invasive glucose tracker it’s been developing for over a decade.

The journalist said the app’s idea was to “show consumers how certain foods can affect blood sugar.” After all, the study was intended to “explore possible uses for blood sugar data and what tools the company could potentially create for consumers.”

Gurman says Apple has paused testing of this program as the company focuses on other health features.

In a previous reportthe journalist said a blood glucose sensor was still years away from release. At the time, he explained that Apple may use short-wave infrared absorption spectroscopy for the blood glucose sensor for a future Apple Watch.

“This technique involves shining lasers through the skin and into the interstitial fluid between the blood vessels and the cells they serve. The intensity of the light’s reflection back, researchers have found, can be used to calculate the glucose concentration in the interstitial fluid and, by extension, in the bloodstream — and it the only thing that has had to penetrate the body is light,” the publication explains.

But because a non-invasive system needs to see through a wide range of skin tones and analyze different blood types, Apple is still struggling to get all the data it needs. The company plans to use AI to sift through raw data and generate a prediction for when a person might develop diabetes.

That said, Apple may launch a feature before the full blood glucose sensor that monitors a person’s blood sugar trend and warns users of prediabetes, as this new report confirms.

BGR will let you know when we learn more about the future Apple Watch features.