Can you prove that it's not? If you state the contrary with certanty you must present atleast some evidence that food has no effect on it.
Even wiki has this info:
>> Diet may be a modifiable risk factor for the development of Alzheimer's disease. The Mediterranean diet, and the DASH diet are both associated with less cognitive decline.
Even wiki has this info: >> Diet may be a modifiable risk factor for the development of Alzheimer's disease. The Mediterranean diet, and the DASH diet are both associated with less cognitive decline.
https://en.wikipedia.org/wiki/Alzheimer%27s_disease#Diet