Uncoupling protein 1 (UCP1) is a mitochondrial protein that facilitates fat burning into heat without significant work, playing a role in thermogenesis.

“one of these is ucp1 uncoupling protein one it's a mitochondrial protein that allows your mitochondria to burn fat without doing a lot of work it just turns the fat into heat it's involved in thermogenesis”

“I know that UCP1, the uncoupling protein, which norepinephrine is called, releases norepinephrine and that activates uncoupling protein 1, which then uncouples your mitochondria. So your mitochondria usually are sensing, you know, the electrochemical gradient and when that becomes uncoupled, the mitochondria go, "Oh my God, I need to make energy." So they're basically burning all the energy, like you said, to generate heat and to also make energy.”