What Lumen burns mostly fat? Understanding your metabolic state
                                
                                
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                                    4 min read                                
                            
                                According to the makers of Lumen, a low score of 1 or 2 on the device indicates that your body is predominantly burning fats for energy. This fat-burning state is a key metric the Lumen device helps users track in real-time by analyzing the carbon dioxide concentration in their exhaled breath. The goal of using Lumen often involves training your metabolism to become more flexible, meaning it can efficiently switch between using fats and carbs for fuel.