You can optimize endurance, recovery, and overall performance on a plant-based diet by matching calories to mileage and targeting 5–10 g/kg carbs and 1.2–2.5 g/kg protein, with fats at 20–30% of calories from unsaturated sources. Prioritize whole grains, legumes, fortified plant milks, and varied proteins; supplement B12, monitor iron and vitamin D, and consider algae DHA/EPA. Time carbs and protein around runs, use quick snacks and gels during long efforts, and follow meal plans for practical guidance if you want more specifics.