Sugar is a huge trigger for inflammation for many people.

Look up AIP diet if you want to reduce inflammation a lot. Changed my life

I looked I the AIP diet on your suggestion. It looks very difficult. Good luck to you.

AIP is tough but you don't have to do it forever, just long enough for your body/gut to heal and for your immune system to calm down. Maybe 3 months.

I had such bad IBS at one point I thought I was dying. Doctors weren't interested in helping me because they couldn't see anything wrong. The AIP diet turned my life around. Now eat most normal foods but still avoid gluten.

Difficult? You control what you shove down your neck, no?

There are many publications on this topic, yet "as of today there is no clinical trial indicating a relation between sugar and Alzheimer"

But some publications are really impressive like this one, which says that sugary drinks are particularly harmful:

https://pubmed.ncbi.nlm.nih.gov/36625082/

I believe the lack of memory excercise is bad for memory.