Fiber does more than aid digestion—it plays a vital role in keeping mitochondria, the energy-producing “powerhouses” of cells, functioning efficiently. Healthy mitochondria support energy, focus and resilience, while poorly functioning ones can contribute to fatigue, brain fog and inflammation. Gut bacteria convert fiber into butyrate, a compound that fuels gut mitochondria, strengthens the intestinal barrier and protects against inflammation and disease. Low fiber intake weakens the gut barrier and reduces butyrate production, allowing toxins and inflammatory molecules to enter the bloodstream. Eating diverse, plant-based fibers and resistant starches—and pairing them with protein and antioxidant-rich foods—nourishes gut bacteria, boosts butyrate levels and strengthens mitochondria for…