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Here is a explanation:
When you eat, your body process the food and tries to utilize it for different things (Nutrients absorpsion, muscle/fat/bone repair and creation and so on). This processes are not 100% independent and they are modulated via several ways, as an example insulin regulates(or inhibits, depends who you ask) lyposis, which is the fat burning process.
There are a large number of ways to regulate all of this process and to some extend they all regulate each other constantly.
Now, the yoyo effect, i.e. ganing lots of ways after finishing a diet: After your body runs in a deficit for a whiley your body is behaving as is food was scarse then, when you increase your calorie intake your body uses its enzymes, hormones and whatnot to assure that the most energy is saved, it can do this, going back to the fat example by raising your insuling levels more than usual and so, storing more energy from the same meal.
It makes sense from a evolutionary view also, your body can't try to store everything when your starving, since it needs the extra effort to go get food, then, when you find the food it tries to store it all and also, since it has enough you can spare some hours of letargy, i.e. why peoole get sleepy after a big meal. Also relevant, when you are in a deficit your body starts pumpling growth hormones, even tho it has nothing to grow off, but the hormone is there to kick start creation as soon as some extra energy is avaliable.
Of course that, compunded with how normally people tent to underestimate their calorie intake is even worst. Which happens a lot.
This is literally it. It's nothing to do with anything else you posted. People get fat or regain the weight not because they dieted and not because of some bullshit cave man theory... it's because they go back to over eating.
Well... Is not a caveman theory... Is actually kind of a new topic in nutrition...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9036397/
This paper even address the first law of thermodymics, which you really do not seem to understad. Bodies do not use 100% of the energy in your food, the usaged percentage is variable and what is not use you just shit, conserving the 1st law.
And true, people go back to eat too much, but you can't assure that 100% of the cases of weight regain after diet are coused because of that, there are:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6082688/
This is quite the hot topics between nutrition experts, but I'm guessing you already know that, since your seem to belive to already have analysed all possible information about this ultra-complex topic.
Yes, CICO works most of the time if you count well enough, but there are somw cases where your hormones will just fuck you over.
I really can't tell if you're trolling or if you reaaaaaaallyyyyy think you know what the 1st law actually means but are not capable enough to see that open systems are not bound by it in the way you think they are.
https://bookdown.org/asvn90/Understanding-Thermodynamics/the-first-law-for-open-systems.html
Take a look at chapter 5.2, it explains how the 1st law applies to open systems -like your body, in case you don't get why I am talking about open systems-
In shot
Food = energy + shit (+others)
You can shit more or less, depending on how your body process food. I hope that one is simple enough for you.
Also: maybe is easier to understand https://www.youtube.com/watch?v=lPrjP4A_X4s
This paper is also not about the starvation theory, this is about fasting.
No where have I said that, I've literally pointed out multiple times now, that people who gain weight, don't magically do so with less calories. You all continue to spew HAAS bullshit about how people can magically gain weight on less, as you do just in the next line here.
Yes...yes you can. Holy shit, you cannot create more mass from less. Again, I'm not the one that doesn't understand physics here.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6082688/
Are you even reading the papers your linking here?
There is only one way to gain weight, eat more than your body needs. This is not rocket science and all studies you have linked so far point this out. None of them have stated in any way, that people eating less than their bodies need magically gain weight.
No, thats still eating to much.
I... don't know if you're trolling either at this point, you clearly don't understand any of the articles or papers on this topic. Thermodynamics is not going to magically change because you think you're body is somehow different because you gained weight.
What's with you all thinking I believe that your body is %100 effective at using calories....the fuck is with you.
Yes, totally, that's why people get fat, because they can't shit like skinny people.
Fucking stop. CICO is physics, you're eating to much if you're gaining weight. PERIOD.
Also: maybe is easier to understand https://www.youtube.com/watch?v=lPrjP4A_X4s
Ah yes a YT video, is this one going to explain how I'm wrong....and that obesity comes from people eating "normal" and it's not their fault that consuming 4.5k calories a day made them obese...
I feel like I'm arguing with a climate denier.