The only honest answer is "we do not know", w.r.t very long term dietary ketosis. I would be skeptical if anyone claims absolute certainty on this.
Kids who were kept on such diets, would normally transition to normal diets, they apparently either outgrow epilepsy or can take drugs to control it once they get older. None of the kids preferred to stay on it for life either, I've been told (altho that neuro's sample would be small), it is quite burdensome.
Encouragingly, many mountain tribes eat primarily meat/fat based diet, and the same goes for Inuit tribes in the Arctic. They eat such diets for their entire life, and mountain tribes often have quite long lifespans on primarily sheep meat/fat and some greens. a little bread/starch every now and then.
So maybe it is safe for some period of time. It is not clear what health risks you accept as trade-off, nothing is free.
Intermittent fasting on the other hand is extremely safe and is privately practised by several physicians I trust. They all seem to be in great shape for their age, fwiw.
Kids who were kept on such diets, would normally transition to normal diets, they apparently either outgrow epilepsy or can take drugs to control it once they get older. None of the kids preferred to stay on it for life either, I've been told (altho that neuro's sample would be small), it is quite burdensome.
Encouragingly, many mountain tribes eat primarily meat/fat based diet, and the same goes for Inuit tribes in the Arctic. They eat such diets for their entire life, and mountain tribes often have quite long lifespans on primarily sheep meat/fat and some greens. a little bread/starch every now and then.
So maybe it is safe for some period of time. It is not clear what health risks you accept as trade-off, nothing is free.
Intermittent fasting on the other hand is extremely safe and is privately practised by several physicians I trust. They all seem to be in great shape for their age, fwiw.