For sustaining energy during endurance activities, which nutrient is critical to replenish?

Carbohydrates are the primary source of energy during endurance activities. When engaging in prolonged physical activities, the body relies on glucose stored in the form of glycogen in muscles and the liver. As these glycogen stores deplete, performance can decline, leading to fatigue and decreased endurance.

Replenishing carbohydrates during and after endurance activities is critical for maintaining energy levels, supporting performance, and aiding recovery. They not only replenish depleted glycogen stores but also help facilitate the absorption of fluids and electrolytes, which are essential during extensive physical exertion.

While proteins play a role in muscle repair and recovery, and fats serve as an energy source in longer-duration, lower-intensity activities, carbohydrates are essential for quick energy replenishment and optimal performance during high-intensity endurance exercises. Vitamins are important for overall health and metabolic processes but do not directly provide energy. Thus, carbohydrates are crucial for sustaining energy during endurance activities.