Often when reading papers on obesity, authors will quite commonly refer to body weight regulation as "complex". They will say things like, "bodyweight is regulated by a complex system of redundant networks". etc blah blah
Usually, they will use this type of terminology only when referring to the difficulty of producing meaningful and sustained reductions in bodyweight. Although its also used to explain why bodyweight usually returns to normal after overfeeding studies.
And yet, the very same authors will quite facilely state that obesity is "caused" by over-eating and/or sedentary behavior.
So here we are presented with something of a paradox and contradiction, because, on the one-hand, bodyweight is supposed to be complex regulated system, but, it is easily manipulated by simple CICO, by simply having a bit extra on your dinner plate, or by simply missing your morning workout, you can apparently very easily change your bodyweight.
Nothing is more simple than overeating and being lazy. But apparently these simple actions can very easily produce large and sustained perturbations in a complex and regulated system. I.E. bodyweight.
Now, how can bodyweight be a regulated, complex and redundant system if it can be perturbed by such simple stimuli? Doesnt that sound contradictory? Isnt the point of a complex system is that its not easily perturbed? And protected from simple stimuli producing significant changes.
The only way to solve this contradiction is that, one of the premises is wrong. Either.....
1) bodyweight is a NOT a complex regulated system, but is a simple matter of CICO
2) overeating and laziness are not CAUSES of bodyweight changes, I.E. these simple stimuli are not capable of producing significant perturbations in the complex regulated system.
So please, obesity researchers, which is it? Complex or not? Either bodyweight is a complex regulated system or its a simple CICO program.
Can you make up your mind please?
There is a possible 3rd
3) only reductions in bodyweight are part of the complex regulated system, meanwhile increases in bodyweight are a simple CICO system. If this is true, then beware, because every time you overrate a measly 5 calories, those 5 calories become a permanent addition to bodyfat!