I can only speak from my own experience. Some of that was gained months before they started calling Alzheimers Type 3 diabetes and talking about links to sugar and carbs. As many of you know, I have FMS and have had it since 2001. Well, I was diagnosed then but I can pick up links that go back much further than that. Fibro is a crappy thing on all fronts but the thing that has wiped out my career and brought me to the edge of suicide was the brain fog. On a good day I had almost no short term memory. On bad days I totally lost my ability to read and understand a page of writing or numbers. Sometimes I was unable to even string together spoken words. Trust me, when you have had a good career and everything looking good for you its a bitter blow to be reduced to something on the verge of a vegetable. As part of the FMS I piled on weight and was sliding into Type 2 and insulin resistance. Over a period of years I tried every diet and a multitude of supplements but never lost more than a stone and the FMS reached a stable plateau but didn't improve. I decided to give low carb a go in desperation. At that point a bar of chocolate was about my only pleasure in life so it was a hard decision. It was, however, my best decision yet! Not only have I lost a further 3 stones, but within the space of a fortnight my energy levels soared and my brain function has improved no end. It really has turned my life round.
Sorry this is long but I want people to realise that it is worth a shot. I went into it to get my BG down and lose weight but the effects have been great for me. I have read a lot about ketogenic diets and the effects of grains and carbs and there is a lot of sense coming through regarding how brain function can be preserved even in people who already have a diagnosis of Alzheimers and certain other neurological conditions if you change the brain's source of fuel from glucose to ketones.
I am also gluten intolerant so I was halfway to giving up grains anyway! I would also second more of Rawkaren's postings and say not to just think that coeliac disease is all about gut pains and diarrhoea! Gluten affects epithelial tissue. OK, you get a huge amount of that in your gut lining, but it lines every other part of your body too, eyes, joints, cheeky bits! Not to mention skin being epithelial tissue. I had years and years of suffering huge mouth ulcers and not one doctor or dentist picked up on it being down to gluten! Since giving it up I know how many of my other bits were also affected!
Sorry this is long but I wanted to back up Rawkaren with personal experience rather than just sections from a book that people are questioning.
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I certainly don't take all the supplements suggested in the book and I follow a LCHF diet as listed on the Diet Doctor's site. Its up to everyone to find their own path but if you do think you are in danger of dementia then its something to look into that doesn't cost anything. OK, I know some people say low carb is expensive, but that's usually just at first. When you get into it you actually eat much less as its much more satisfying and you don't need so much.