Influence of the Mediterranean and Ketogenic Diets on Cognitive Status and Decline: A Narrative Review

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7231139/

"There is no single dietary pattern unequivocally proven to prevent AD (Alzheimers). Nevertheless, epidemiological data suggest that by adopting several dietary habits, especially if accompanied with a healthy lifestyle, the negative consequences of AD could potentially be delayed. Alongside with others, two specific eating patterns have been well investigated concerning their potential beneficial effect on cognitive status: the Mediterranean diet (MedDi) and the Ketogenic Diet (KD). Despite the different underlying mechanisms, both of them have demonstrated a fairly profitable role in reducing or delaying cognitive impairment. The aim of the present narrative review is to overview the existing research on the efficacy of MedDi and KD against AD-related cognitive decline, focusing on the proposed protective mechanisms of action. "

Choice of the word " profitable" seems out of place. I can see two meanings but why is "profitable "relavent. Clearly need to read whole paper to fully understand.
Otherwise, imho, Keto and MD are far more similar when compared to the Std American diet. While MD has rice and other rich carb foods, its not even close to the 300 carbs recommmended for diabetics by dieticians for years. ( I hear the current recommendation is half that now.)

Pour info, I'm only posting articles where the full pdf is available online.