Why Metabolic Health Starts at the Cellular Level When people think about metabolism, they often think about weight or blood sugar. But true metabolic health begins much deeper—at the level of your cells. At the center of cellular energy production are the mitochondria , often referred to as the “powerhouses” of the cell. Mitochondria are responsible for converting nutrients into usable energy (ATP), which fuels every process in the body—from muscle movement and brain functio