Mitochondria — tiny fuel cells living inside your cells — are essential to your body’s energy production and overall health. Though they started as independent bacteria billions of years ago, mitochondria have become crucial organelles responsible for powering almost every process in your body. Understanding how mitochondria work and how to support their health can transform your energy levels, fitness, and longevity. What Are Mitochondria, and Why Do They Matter? Mitochondria originated from a symbiotic relationship between ancient bacteria and early eukaryotic cells around 2.4 billion years ago. Unlike other organelles, mitochondria have their own DNA, inherited maternally, and reproduce by splitting. Their primary role is to produce adenosine triphosphate (ATP), the fuel that powers nearly every energy-consuming process in your body, from muscle contractions to brain activity. The Complex Role of Mitochondria in Your Body Beyond energy production, mitochondria regulate important cel...