[Ferret7446]

> The human body is way more complex than CICO

The human body is way more complex so as to defy the laws of physics as we know it? The human body cannot create matter. In order for it to increase in mass, you must be inserting extra mass into it.

[immibis]

Note that none of the known laws of physics say that excess energy is saved by converting (which raw materials?) into fat and storing them.

[grecy]

Sure, a mammal does not HAVE to store excess energy.

But that is entirely irrelevant when a mammal eats less energy than they consume for a while. In that instance they MUST burn some stored reserves or break the laws of physics

[immibis]

An equally plausible hypothesis is that the mammal feels lethargic and does not consume more energy than it eats.