Sharp’s first smartwatch, the Karada Mate Watch, aims to end the “log everything” routine. Using a bioelectrical impedance sensor partnered with HEALBE Corporation’s FLOW Technology, it estimates calorie intake from changes in body water and sugar levels, whil
The moment you wear it, the pitch is simple: you shouldn’t have to type in what you ate.
Sharp’s new Karada Mate Watch is its first step into wearables. and it comes with a tracking method that many mainstream smartwatches still don’t offer. Instead of asking users to log meals. it uses a bioelectrical impedance sensor to monitor changes in body water and sugar levels. then estimates calorie intake from food and drink in real time.
Sharp says the smartwatch was built for this capability in partnership with HEALBE Corporation, a California-based biometric data firm. The calorie estimation feature runs on HEALBE’s patented FLOW Technology. By reading fluid shifts and sugar changes in the body. the watch approximates how many calories have been consumed and plots that against calories burned to provide a running calorie balance.
Hydration is handled in the same “no input needed” style. The Karada Mate Watch monitors hydration levels and sends audio and vibration alerts when your water intake falls too low.
That adaptive display is another part of the story. Sharp calls it Circuit View. In the morning, it shows sleep duration, weather, and your schedule. During the day, it surfaces step count, heart rate, and calories burned. Before bed, it switches to the next day’s forecast and upcoming plans.
Beyond the calorie gimmick, the hardware looks built to live on a wrist. The watch uses a 1.32-inch OLED panel with a 466 x 466 resolution and always-on support, paired with Corning Gorilla Glass 5. It also includes a skin temperature sensor, SpO2 monitoring, and connectivity via Bluetooth 5.4.
It’s rated water resistance at 5 ATM with IP6X dust protection—an important detail when the device is meant for continuous body monitoring. Compatibility is also clearly spelled out: the Karada Mate Watch works with devices running Android 14 or later and iOS 17 or later.
Sharp’s release plan is Japan-first. The Karada Mate Watch launches on July 9 in Japan, priced at 59,400 yen (about $370), and will be sold in gold and silver. There’s no information on international availability.
The watch also comes bundled with an ongoing service. Sharp will offer a 600 yen (about $4) per month subscription through the companion Karada Mate app. That subscription is set to provide dietitian-supervised guidance covering diet, sleep, exercise, and overall physical condition.
Passive calorie intake tracking has been a stubborn gap in wearables for years. Sharp’s approach gives the Karada Mate Watch a credible technical foundation on paper—built around fluid shifts. sugar changes. and a biometric workflow powered by HEALBE’s FLOW Technology. But for buyers. the deciding factor will be the one thing no sensor can guarantee: whether the numbers match real life closely enough to trust.
Sharp Karada Mate Watch calorie tracking smartwatch without logging meals bioelectrical impedance sensor HEALBE FLOW Technology hydration alerts Circuit View display OLED 466 x 466 5 ATM IP6X dietitian supervised subscription wearable technology Japan July 9
So it just knows how many calories I ate?? okay sure.
I don’t get how “body water and sugar levels” = calories. Like, hydration messes with everything already. Seems like it’ll be wrong half the time and then people blame themselves.
Isn’t this the same concept as those other watches that “measure” stuff through your skin? I feel like it’s gonna work for one person in one lab condition and then everyone else is stuck recalibrating. Also the audio alerts for water?? my wrist is gonna start nagging me now.
Hmm bioelectrical impedance sounds like those cheap body fat scales. If it can track SpO2 and skin temp then sure whatever, but calorie counting without input feels kinda like magic. I bet it’ll miss when you drink coffee or eat salty stuff and then the “balance” looks dramatic. Still I kinda want to try it just to see if it roasts me for being dehydrated.