Galaxy Watch8 Brings Nutrition Tracking to the Wrist

Samsung introduces antioxidant monitoring for everyday health insights

Samsung has unveiled the Galaxy Watch8 with a new Antioxidant Index, a feature designed to measure carotenoid levels directly from the wrist. By placing a thumb on the sensor, users can receive results in as little as five seconds, offering a snapshot of dietary impact on the body. The technology builds on years of research and miniaturization of lab-grade sensors into a wearable format. It represents a step toward making nutrition monitoring more accessible outside clinical settings.

From Lab Equipment to Wearable Sensor

Traditional methods of measuring carotenoids relied on Raman spectroscopy, a laser-based technique requiring large machines. Engineers spent seven years refining the process into a compact BioActive sensor that uses LEDs and photodetectors to analyze skin absorption changes. The breakthrough came from integrating reflective spectroscopy with LEDs, enabling accurate readings without sacrificing portability. Continuous calibration ensures personalized and reliable results across different users.

Designing the sensor to work for all skin tones posed another challenge. Developers chose the fingertip for measurement, where melanin levels are lowest, and applied light pressure during scanning to reduce interference from hemoglobin. Clinical validation at Samsung Medical Center confirmed the sensor’s accuracy across hundreds of participants. This testing prepared the technology for global rollout in consumer devices.

Understanding the Antioxidant Index

Carotenoids are natural pigments found in fruits and vegetables, serving as markers of dietary quality. The Antioxidant Index categorizes levels into three ranges: very low (below 50% of WHO recommendations), low (50–100%), and optimal (above 100%). Because skin carotenoid levels change gradually, the index reflects long-term dietary habits rather than short-term fluctuations. Lifestyle factors such as stress, sleep, and physical activity also influence results.

Experts highlight the importance of antioxidants in reducing risks associated with reactive oxygen species, which can contribute to heart disease, diabetes, and cancer. The Galaxy Watch8 combines the index with other health features like sleep tracking and activity monitoring to provide a more complete picture of wellbeing. Users can track progress over weeks as dietary improvements gradually raise carotenoid levels. This integration positions the watch as a tool for proactive health management.

Broader Implications for Health Monitoring

Researchers believe wearable sensors like the Galaxy Watch8 could encourage healthier eating habits by making nutrition data more visible. Professor Yoonho Choi of Samsung Medical Center noted that such tools may help prevent age-related diseases over time. Until now, few consumer devices offered reliable antioxidant measurement, leaving a gap in personal health tracking. The new feature addresses this need while expanding the role of wearables in everyday wellness.

Samsung’s innovation may also support future research by providing large-scale data on dietary patterns and antioxidant levels. Reliable carotenoid measurement could become a milestone in nutritional science, offering insights into population health trends. For consumers, the watch provides a way to detect risks earlier and take action to preserve wellbeing. As wearables evolve, they are increasingly central to fostering more conscious lifestyles.