To maintain hydration during a 12km road march, what food item would best aid a soldier?

A banana is a highly effective food item for maintaining hydration during a 12km road march due to its high water content and electrolyte balance, particularly potassium. The banana contains about 74% water, which can contribute to hydration when consumed. Additionally, it provides easily digestible carbohydrates for energy, necessary for sustaining performance during extended physical activity.

The potassium found in bananas is crucial for maintaining proper muscle function and controlling hydration levels in the body. This is especially important during long marches, as soldiers can lose significant electrolytes through sweat.

In contrast, other choices may not offer the same benefits for hydration. Peanuts and bread are less hydrating, as they have lower water content and can be more calorie-dense without the requisite water or electrolytes beneficial for hydration. Energy bars may provide quick energy but often lack sufficient moisture and might contain high sugar content, which could lead to a quick spike and subsequent drop in energy levels without effectively addressing hydration needs.

Therefore, a banana stands out as the best option for both hydration and energy during a prolonged physical effort like a road march.