This research is interesting and supports my assertions on dietary iron in "Eat To Cheat Dementia." Research suggests that excessive accumulation of the mineral iron in the brain is associated with dementia (and Parkinson's disease which is of course another neurological disease).
The research is suggesting the iron problem is possibly a combination of taking too much in and something going wrong in the brain so excess is not cleared out as it should be. It's quite often said by people not qualified in nutritional science that's the fault lies with eating red meat (an excellent, natural source of iron).
But I suggest it's more likely to be eating too many foods which wouldn't usually be high in iron so have had 'artificially' added to them during production (fortified breakfast cereals and nutritional supplement powders especially) or to taking multivitamin/mineral tablets taken when there is no diagnosed deficiency: these contain not the haem-type iron of red meat that the body deals with more easily, but a less accessible type it doesn't deal with as well. It seems to me that the bulk of the evidence on nutrition and brain health points to eating foods as close as possible to their original form. Meat is a great source of protein and as long as you balance it with lots of plant foods you are unlikely to go wrong. Maybe it's when you interfere with foods and add things that were never there, then eat lots of them, that things might go awry. Eat real food.
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