Hi Verena,
I'm so sorry to hear about your MIL. My mother & grandmother both had dementia so I have an interest in the subject. I came across a couple of recent books that are quite compelling in using multiple interventions including diet to treat dementia. The authors are Drs Dean & Ayesha Sherzai and the other is Dr Dale Bredesen. We all have seen the power of nutrition so worth a look maybe.

I'll be thinking of you and our family, sending light.

janice