This diet makes sense only if it can cure the epilepsy after a while, not as long-term treatment to simply control the symptoms. What’s the point of being seizure-free if you’re going to develop all sorts of health problems and probably reduce your life expectancy and quality of life due to malnourishment?
I had uncontrolled epilepsy between the ages of 5 and 24 (diagnosed when I was 8). Luckily for me, I had localized “petit mal” seizures in the right temporal lobe, which meant I could possibly benefit from surgery. So I went under the scalpel in 1992 and I’ve been seizure-free since then, without any side effects or loss/changes in mental acuity, and completely quit taking medication in 1995. It would be great if some kind of surgery could be effective on the more generalized “grand mal” seizures like in the case of this kid doing the keto diet, but I think research should be done mostly on treatments that won’t potentially create new health problems as side effects.
ETA: Adverse effects such as these ones.