How does your body use 2000 calories each day, but you need to run an extra mile to use up an additional 100 calories?

Question

Why can’t we eat and lose calories.. LOL

In: 209

Answer 1

“Why cant we eat and lose calories” – you actually do lose calories while eating. All those muscles that contact, it means tons of electrical signals, tons of channels being opened and closed and all of that requires energy, then there is secreting juices for digestion which also requires energy, then transfer of aminoacids, sugars and fats to the liver and to the rest of the body, then processes of synthesis.

AS i’ve said, electrical signals are just bunch of channels being opened and closed and ions changing positions in the cell, but it requires insane amount of energy. Now can you imagine brain with 86 billion neurons and how much energy it requires just to keep functioning ? Even though brain is responsible for the 2% of the weight, it uses 20% of the daily energy.