How could diet affect energy and fatigue?

Food choice is foundational for sustaining energy, as calories are metabolized into ATP, the primary source of energy that fuels cell needs. Healthy, nutrient dense dietary patterns support the energetic demands of life, prevent conditions that increase risk for fatigue, and have been used in studies to reduce fatigue and increase energy.^[1][2] Some foods contain nutrients at doses shown to support energy and resist fatigue either in general (e.g., iron in red meat) or during exercise (e.g., nitrates in spinach).^[3]