Researchers have developed a handheld breathalyzer capable of determining when the body is burning fat by measuring acetone levels in the breath. This new device, named Nutrion, aims to provide an accurate and convenient way to track ketosis, the metabolic state where fat is used for energy.

Unlike existing methods which often rely on less precise bioelectrical impedance or require lab-controlled conditions, this breathalyzer filters out moisture and contaminants. A companion app guides users through the breathing process, ensuring accurate sample collection comparable to blood-based tests. In a study involving 12 participants, the device closely matched traditional laboratory results across various diet and exercise scenarios.

The technology holds potential for various health applications, including monitoring the effectiveness of GLP-1 therapies and enabling athletes to optimize their metabolism. This development offers a more accessible method for individuals to understand their body's fat-burning status.