The American Nutrition Association (ANA) calls for the wider use of evidence-based biomarkers in personalized nutrition care to manage chronic diseases. It highlights the potential of a new real-time biomarker test for metabolic health based on a blood sample drawn from a finger prick. However, the organization tells us policy changes and medical nutrition training are key to ensure equitable access to these tests. Detailed in a paper in Frontiers in Science, the new biomarker test called the glucose ketone index (GKI) could potentially help track and manage the metabolic dysfunction behind cancer, cardiovascular disease, type 2 diabetes, obesity, and neurodegeneration.