Vampire bats made to run on treadmills in a lab reveal ... “In most animals, amino acids are a fuel of last resort. It’s what the body burns when there’s not much left, but these bats ...

Unlike fats and carbohydrates, amino acids cannot be stored in the body as energy reserves. This reliance on proteins leaves ...

Most mammals respond to the demands of exercise in the same way, by breaking down carbohydrates and stored lipids (fats) in their bodies, releasing the energy they need to keep functioning.