Lumen is a handheld device and app that measures metabolism in real time by analyzing carbon dioxide levels in your breath. The technology determines whether your body is primarily burning fats or carbohydrates for energy, providing immediate insights into your metabolic state. Based on these measurements, the system delivers personalized daily nutrition plans, macro recommendations, and lifestyle guidance tailored to your unique metabolic profile.

The device uses CO2 sensors, flow meters, barometric pressure, and temperature sensing technology validated by multiple peer-reviewed studies to match the accuracy of gold-standard metabolic carts. Unlike traditional metabolic testing that requires lengthy procedures and costs hundreds of dollars per session, Lumen enables unlimited measurements anytime and anywhere in under a minute.

The accompanying mobile application integrates with Apple Health, Google Fit, and Garmin to provide a comprehensive view of how nutrition, exercise, sleep, and stress affect your metabolism. Users receive science-backed coaching videos, actionable strategies for improving metabolic flexibility, and personalized recommendations synchronized to menstrual cycles for female users. The platform includes AI-powered food logging, fasting trackers, and workout optimization features.

Lumen has been used by over 300,000 individuals seeking weight management, improved energy levels, fitness optimization, and long-term metabolic health. Clinical studies demonstrate that users can achieve up to 12 percent body weight reduction in six months and 30 percent improvement in metabolic flexibility scores. The system is designed for adults looking to build sustainable habits around food and recovery while gaining confidence through data-driven decision making.