Another study regarding the Dietary Inflammatory Index (DII).

A 2019 study by concluded

“The data suggest that a pro-inflammatory diet, as indicated by increasing E-DII score, is associated with schizophrenia. This is the first study to examine the association between the DII and schizophrenia in a Middle Eastern population. Although these results are consistent with findings from research conducted in depression, additional studies are required before generalizing the findings to other populations.”

Source 

Jahrami H, Faris MA, Ghazzawi HA, Saif Z, Habib L, Shivappa N, Hébert JR. Increased Dietary Inflammatory Index Is Associated with Schizophrenia: Results of a Case-Control Study from Bahrain. Nutrients. 2019 Aug 11;11(8):1867. doi: 10.3390/nu11081867. PMID: 31405205; PMCID: PMC6722742.