Question

Recently, I have started working on my weight and, having a curious mind, I looked deeper into this whole exercise/metabolism/energy production thing. And I became curious how much water is needed to burn 1000 calories while doing aerobic exercise.

At first I looked into glucose oxidation and it looked pretty straightforward - fully oxidizing 1 glucose molecule generates so much energy and releases 6 water molecules. So unless a lot of water is involved in breaking down glycogen to individual glucose molecules, it's a no-brainer.
Then however I realized that glycogen is used in moderate-to-intensive exercise, while I am curious about slow energy burning exercise like walking. And apparently in this case, especially after some time walking, the body starts burning fat. This is where I am completely lost, as it is way above my high school level of biochemistry, most of which I have forgotten.
So my question is, is water consumed or released while burning fat? And how much would it be in order to generate 1000 kcalories?

Answer 1

During aerobic exercise, the body primarily burns fat for energy. The water produced during fat metabolism is minimal compared to the energy released.

Step-by-step explanation:

During aerobic exercise, the body primarily burns fat for energy. The breakdown of fat releases energy and produces carbon dioxide and water. However, the water produced during fat metabolism is minimal compared to the energy released. Therefore, the amount of water consumed or released while burning 1000 calories of fat during aerobic exercise is negligible.