It's amusing to me people consider, say, the SAD as "meat-based", when the average american gets about 70g of red meat per day.
I try to only get carbs from fruit, milk, and potatoes to keep the carbs clean.
I dont get cramps but I do supplement magnesium glycinate or taurate daily you may want to look into that if you havent.
Ive fasted for multiple days and done cardio each day w/ no cramps, just sharing my experience.
Take away the sugar, alcohol ,and seed oils and meat eaters are all healthy.