The science supporting the relationship between carbohydrates and dementia is quite exciting, as it paves the way for lifestyle changes that can profoundly affect a person's chances of remaining intact, at least from a brain perspective.
I like meat and carbohydrates.
Our demand for meat, dairy and refined carbohydrates - the world consumes one billion cans or bottles of Coke a day - our demand for these things, not our need, our want - drives us to consume way more calories than are good for us.
Carbohydrates, and especially refined ones like sugar, make you produce lots of extra insulin. I've been keeping my intake really low ever since I discovered this. I've cut out all starch such as potatoes, noodles, rice, bread and pasta.
The dirty little secret is that I grew up in a household where there were no carbohydrates allowed, ever. No cookies, no bread, no potatoes, no rice. My mother was very extreme in terms of what she served. Since I left home more than 40 years ago, I've been making it right for myself.