What is a quick source of energy during physical activity?

A quick source of energy during physical activity is best provided by simple carbohydrates. Simple carbohydrates are made up of smaller sugar molecules that the body can quickly digest and absorb. When consumed, they rapidly raise blood sugar levels, providing an immediate source of energy that can be utilized by working muscles during intense or prolonged physical activity.

In contrast, complex carbohydrates, while valuable for energy, take longer to break down and convert into glucose. Proteins primarily serve as a building block for muscle repair and growth and are not primarily used for energy during exercise. Fats are a dense source of energy but are metabolized more slowly and are typically used during lower-intensity activities. Therefore, for quick energy during exercise, simple carbohydrates are the most effective choice.