You may want to research how a ketogenic diet or adding esters (MCT or coconut oil) to the diet helps dementia patients. With dementia (Alzheimers AKA type diabetes), the brain cannot use glucose, so it is starving for energy. Alt fuel (ketones from fat and oils) make a big difference. Here is one article to get you started: https://pubmed.ncbi.nlm.nih.gov/31996078/

It may sound wacky, but many docs will not share this information, either because they are looking for a drug or because they believe the patient or caregiver isn't willing to change diet. However, even just adding MCT oil helps.