e.g. consider you could elect to not eat carbs at all in your one meal.
And metabolism doesn't work like that in the first place. Even if you actually spiked your glucose by eating something silly such as sugar, it would go quickly up then quickly down, unless you're severely insulin resistant.
Restricting carbs severely without the intention of entering ketosis is very not fun for most people, I find. It’s keto flu without any of the benefits.
Intermittent fasting is about letting the body be like this, as it naturally would. That's why meals are time-boxed to a small window within the day: To let it fast during the rest of the day.
The more frequently a person eats, the less likely his body is to enter ketosis. Until it becomes unable to; it just gets hungry every few hours instead, where the person just feeds and perpetuates the cycle of not entering ketosis.
It is no lie that humans were hunters/gatherers until very recent history.
>doesn't explain...
How do you explain the fact I only eat once a day, and I am fine in that regard?
Note that my meal usually includes rice (aka carbs).
Now I have good BMI, not overweight at all, and good energy levels through the day.
I do not get hungry, and eating once saves me a lot of time and effort I can direct towards more interesting endeavors.
Edited parent from "and OMAD" to "or OMAD", because either method works.
Ultimately OMAD is just the form of intermittent fasting that seems to work best for me.