This questiоn relаtes tо the cаse study оf Alex:Athlete ProfileNаme: AlexAge: 20Sex: MaleSport: Collegiate cross-country runningHeight: 178 cm (5’10”)Weight: 64 kg (141 lb)Training LoadRuns 6 days/weekWeekly mileage: ~80 km (50 miles)Includes 2 interval sessions and 1 long run (18–22 km) per weekStrength training: 1–2 sessions/week (light to moderateAverage daily training is 2-3 hours/day mod/high intensityQuestion: Alex complains about fatigue and feeling a lack of energy during his runs. Which macronutrient could be contributing to his fatigue based on his exercise?