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

It takes a lot of energy to sustain 80-100kg of human at 37C for 24 hours, especially if moving, outside, subject to wind etc.

And not just 37 average but it literally can’t let even one body part dip too far for too long.

While there it has to fuel chemical reactions just to breathe, and keep your lungs and heart moving constantly. No to mention keeping digestion going and fighting off infections constantly and replenishing every cell that dies.

And that’s when you’re just laying in bed asleep. When you want and want to move, think and perform actions, your energy usage rises enormously.

But most importantly heat. Even a 500W heater on constantly would struggle to maintain that temperature above room temperature for the mass involved.