Andrew Huberman· PhD
So uh we suspect that there's three main buckets of energy expenses that the the body needs to sustain you know at some point in time. One is vital. You need to keep your heart beating. It's you know your resting heart rate, the brain function, your kidney, you need to be you know detoxifying, clearing the the blood and all of your vital organs. That's vital cost. Second is stress cost, right? If your sympathetic nervous system is activated because you're uh worrying about the future or you know worrying about the past or like you're stressing yourself out this costs energy and then your blood pressure increases that cost energy. Heart rate increases cost energy. You're sweating a little bit cost energy. Your hair rises you know anything that you're you're doing will cost energy and then steal that energy we think from a third bucket which is what we call growth maintenance and repair GMR. uh and those GMR processes happen at the level of organs, right? When you have an organ that gets bigger and stronger, for example, after, you know, weightlifting, uh it can happen at the level of the a cell. If the cell has needs to repair its membrane, needs to repair its DNA. This would be growth, maintenance, and repairing. If you make new more mitochondria, mitochondrial biogenesis after workout, that would be growth, maintenance, and repair.