Your point? the OP ended his sentence with "especially in children" so I thought I'd share that which was relevant to children. If you are looking for information on adults, here are some possible clues:
It makes sense considering the increase in uric acid, but might only be a problem in children and those susceptible to kidney stones (although when it presents in children, that is some pretty important information in terms of holistic, long-term diet considerations). Still definitely worth mentioning and I'm sure we will get more information as more studies are done on adults (most are on children due to it being used as an epilepsy treatment)
https://www.thepaleomom.com/adverse-reactions-to-ketogenic-d...
1. https://pubmed.ncbi.nlm.nih.gov/11095028/
2. https://pubmed.ncbi.nlm.nih.gov/10893623/
3. https://journals.sagepub.com/doi/pdf/10.1177/088307380730192...
4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2852806/
5. https://pubmed.ncbi.nlm.nih.gov/19064531/