Lumen's Information Is Not So Illuminating

An introductory video on the website presents Lumen as the first device for hacking your metabolism. They make a lot of claims that have not been substantiated by good research. With one breath, it tells you what you are currently burning for energy: carbs or fats. By using it in the morning, you can get a personalized nutrition plan for the day. Use it before a meal to see how the last meal affected you. Use it before a workout to see if you have enough energy for a workout or if you should fuel up with a high-carb snack. Using it can help you understand why your weight fluctuates, why you feel low on energy, why your body is storing carbs and converting it to fat. It uses a CO2 sensor and flow meter to determine the CO2 concentration in a single breath. High CO2 means you are burning carbs; low CO2 means you are burning fat.