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@boristrump
The Blood Sugar Diet is worth a read (even if you are not pre-diabetic). It's similar to the 5:2.
https://www.amazon.co.uk/8-Week-Blood-Sugar-Diet-reprogramme/dp/1780722400
There's some quite useful info on the Diet Doctor site.
https://www.dietdoctor.com/
The headaches might be something like this...
https://www.dietdoctor.com/low-carb/keto/flu-side-effects