So first off, I don’t think you should bring the laws of physics into conversations of how human bodies store fat. I know it’s tempting - I’ve been there before - but it’s just too reductive to be useful in the conversation, and it leads to generally poor conclusions.

Are you suggesting our bodies are more efficient and break thermodynamics?

While it’s true that energy cannot be ‘conjured from nothing’ - human bodies don’t quite work on a fixed energy in/out model. They can be variably efficient in how much energy is required to perform certain tasks, and secondary systems can be turned off when the need to conserve energy becomes apparent (leptin is the signaling mechanism for this).

What secondary systems get turned off? You’re body is going to utilize energy anyway it can if it needs it, if it doesn’t it stores it, usually in the form of fat.

The main mechanisms that cause rebound weight gain after sharp dieting is a reduction in passive energy needs stemming from the change in leptin levels, along with leptins very strong effect on appetite.

No it’s from eating way more calories…this is literally junk science your parroting here. The rebound in weight is because someone decides to stuff themselves again.

I suggest to you, and anyone still under the impression that CICO is a useful model for understanding human metabolism, to read the book The Hungry Brain. It’s hugely useful for gaining greater insight into the subject.

That book is about the psychology of overeating.

Hell here is a quote from his AMA:

There are many ways to lose weight, but they all involve either eating fewer calories or burning more.

https://www.reddit.com/r/IAmA/comments/5stv4n/comment/ddhwzhf/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button