So I’m going to clarify the difference between being in ketosis and being keto-adapted.

The body is very smart, and will burn anything that is available for energy. From glucose to alcohol. But some are more prefered than others.

Copy of rebuild diet

Ketosis is when the body turn to body fat for energy, and by eating fat you are constantly supplying the body with energy. You can also be in ketosis if you are fasting, have skipped a few meals, low-calorie diet or eating minimal carbs.
You can say that a Ketogenic diet “mimic” starvation.
Many can find themselves coming in ketosis overnight, have you every woken up feeling a bit foggy or your urine smells a bit stronger than normal?

However, being keto-adapted means that you have “turned” your body around to use its primarly energy source. Your body will not have a need for glucose to function properly. It can take a long time before some becomes keto-adapted. From 1-4 weeks, sometimes longer, sometimes less. This can be very individual. The reason for this is that most of us have lived on a fairly high carb diet most of our lifes, and as a result of this the body does not have many fat converting enzymes. With someone changing their whole diet and have fat as their main source of food intake, the body has to completely convert itself to use fat as prefered fuel for energy. And this is why some people experience low energy levels etc.

They say once you are fat-adapted you will be “back to normal” and I have read(not sure if this is correct) you will not show any ketones in your urine, so ketostix will not be of any use.

So as I’ve touched on earlier is whether or not the liver will make glucose from amino acids by gluconeogenesis?
I have read up a bit more about it, and this is what I’ve figured out:

When you first start on a ketogenic diet, you eliminate carbs from your diet to make your body use fats for energy. Although you will still eat a somewhat amount of carbohydrate, even if its only 10 or 15 g. The brain is the biggest issue when it comes to glucose energy, as on a high carb diet the brain actually needs about 400-500 kcal a day from glucose to work properly. I would assume gluconeogenesis will take place and use both fatty acids and amino acid to convert to glucose for this reason.

However, when you are keto adapted. I’m not sure if the body will have that much of a need to produce glucose. If you have made your body want fats for prefered fuel, why would it want glucose? Well you might say the brain might still want some to function, and it can not directly use fat for energy. But as I’ve said, the body is pretty clever. The amount of different enzymes etc the body has, it always has a way of converting something useless to something useful.

The brain can happily live on ketones for energy. In fact, a ketogenic diet is actually prescribed for people who struggle with seizures, brain injuries and neurological disorders. As making the brain use ketones for energy turns out to be better for the brain? You can find loads of studies done on this.

However back to gluconeogenesis. I would think that if you eat more protein than what the body needs on a ketogenic diet, it has to be used or go somewhere (muscle synthesis, fat stores, conversion to glucose or in the urine). If you eat what it needs, why would it make anything that is not needed? I might be completely wrong here, but this is just my theory of what I’ve read.

I could go very sciency here, but as I think most of my readers might not understand half of what I would be writing I’ve tried to keep it simply. If you want more scientific reading I suggest reading this article.


  1. Yes, glyconeogenesis in the case of excess protein. Protein is a building block that cannot be used as energy by itself. What the body can’t utilize right away will be converted into glycose because that’s the only pathway it can take. The body can’t make ketones out of protein because of different caloric properties. Despite ketoadaptation the body will always be readily available to switch back to burning glycose.


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