Having said that, there are also studies suggesting that long term carbohydrate restriction diets (aka. the keto diet) may result in fast short term weight loss but people gain it all back in the long term. An RCT put 63 individuals on a low-fat diet or a low carb diet, and the study found the low carb dieters lost more weight compared to the low fat group by month 3 and 6, but that the weight loss evened out by month 12. This was confirmed by a Meta-analysis which found that while low-carbers lost more weight than low-fat dieters but the differences disappeared by the one year mark.
Achieving ketosis is a pretty straightforward, but it can seem complicated and confusing with all of the information out there.4If you want to learn more about ketosis and the scientific process around it, you can visit a very in-depth discussion about on Dr. Peter Attia’s website. Here’s the bottom line on what you need to do, ordered in levels of importance:
Secondly, glucose is not the only source of energy for your body. The entire point of the Keto diet is that the body can use fat as a fuel source. Yes, you’ll still need glucose for certain things, but you eat protein and a minimal amount of carbs. The great majority of your energy needs are met by ketones. I don’t dismiss the concerns about accessing muscle for glucose, and I’d be interested in studies involving low intensity weight training on Keto to see if it helps with muscle retention. I think you’d probably have to carefully manage your protein levels as well.
Over 8–10 mmol/l: It’s normally impossible to get to this level just by eating a keto diet. It means that something is wrong. The most common cause by far is type 1 diabetes, with severe lack of insulin. Symptoms include feeling very sick with nausea, vomiting, abdominal pain and confusion. The possible end result, ketoacidosis, may be fatal and requires immediate medical care. Learn more

I have never tried a keto diet (don’t like the idea myself) but I am what you could call moderately (or “liberal”) low carb. Around 125g max net per day, which as you likely know is half the RDA of 250g. I get most of the rest of my energy from protein and some for fat. The RDA of protein, around 50g, is only just enough to sustain muscle of a sedentary or low movement individual – and this is proven by the fact that a lot of people who hit the gym eat easily 2-3x the RDA of protein.

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