You could do this by eating 800kcal of potatoes or mars bars
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Sorry, I disagree with this comment, so much so that I did register to post.
A Keto / Low Carb diet is generally based on either under 30 for Keto or 30 - 50g carbs daily.
Now a diet of 800 calories of potato actually comes to eating 1KG of potatoes (based on using maris piper potatoes), that comes to 790 calories, 178g carbs, 2g fat and 21g protein.
If you then want to look at 800 calories of Mars Bar that’s actually 3 Mars bars at 780 calories, that comes to 120g carbs, 29.7g fat and 7.5g protein.
Neither one of those “diets” amount to Keto, let alone Low Carb, what they do amount to is a starvation diet.
It’s important to understand that Keto does work, it’s been scientifically proven to work by people far more intelligent than me and has demonstrated improvements in people suffering with a number of ailments (including T2 diabetes, blood pressure and for nearly 100 years it’s been used to treat epilepsy).
Now people can successfully live a Keto based lifestyle for the rest of their lives and do so with no adverse affect.
I just wanted to be clear, an 800 calorie diet of potatoes or Mars bars will NEVER be a keto / low carb diet and saying such is just wrong.
Oh and to answer the next question, yes I am keto / low carb, survive on 1800c a day (25 - 30g carbs) and have successfully lost 42lbs of weight in the last 7 months (and still working on it), I am one of those people who is carb intolerant (I love a good mars bar, coke etc but then it makes me fat), the reason for coming back was to check to see availability of a low carb Huel (I’ve used it before and liked it but never successful with it long term).