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First of all, main and only principal of weightloss is calorie deficit. There is no other nonsurgical way to lose weight rather than from calorie deficit.
Now, keto is unreasonable in weightloss because it’s a low-carb diet. Lack of carbs (primary source of energy for humans) makes weightloss harder because someone on keto would feel less energetic for quite some time due to at least adaptation to said metabolic proccesses. In general, forcing organism to get energy from some less efficient and not-quite-as-good metabolic transformation is something that comes from a belief rather than reason.
I don’t mean that one can’t lose weight on keto. But it does increase discomfort during weightloss which increases the chances of giving up on it.
The CICO model describes what happened, not why it happened. There are more clinically useful models such as the carbohydrate insulin model.
We run on fat when we are born, when we sleep, when we skip a meal. Glucose is metabolized before fat because it causes damage if it lounges around. i.e. Alcohol is burned before glucose but we don't claim we are adapted to alcohol.
1-4 weeks is the typical fat adaptation period, and if people maintain their electrolytes they don't have any lower energy levels.
Less efficient is a new one to me? What is less efficient to burning fat? We store fat on the body, the entire point of weight loss is to burn fat - we should encourage people to be in a fat burning metabolism if they want to lose weight.
Belief? The data and the models make predictions people can measure themselves in a few weeks, it is very empirical.
If you know keto works, why do you call it a belief without reason?
I'll agree with you here. Staying on keto means beating carbohydrate addiction. Addiction is strong! However, it is worth the cost of admission - People should be doing keto to get healthy not to lose weight i.e. Don't lose weight to get healthy, get healthy to lose weight.