Fwiw, the ketogenic diet is not safe as per these studies:

1. Ketogenic diets inhibit mitochondrial biogenesis and induce cardiac fibrosis (2021) (PMID 33558457)

2. Ketogenic diet induces p53-dependent cellular senescence in multiple organs (2024) (PMID 38758782)

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Even so, given what little is shared, I strongly feel that this study should NOT have been halted without a very good reason. We know that a ketogenic diet is relevant for epilepsy, and that's sufficient motivation to study it for schizophrenia.