I don't think food supplements have an answer to dementia otherwise the answer would have been found years ago. Food supplements are certainly useful for some health problems, such as arthritis, indigestion etc., but for major illnesses such as cancer and dementia I'm afraid a simple solution is nowhere near.
On the subject of a certain lifestyle causing dementia, my wife always ate a healthy varied diet, she didn't smoke, slept like a log every night after a long challenging days work, didn't drink much, had a wide circle of friends until her dementia surfaced, did a lot of puzzles and crosswords just before dementia hit home,always kept control of her body weight, and generally had a very healthy lifestyle. A healthy lifestyle has not prevented a rapid onset of her dementia.
Articles have been published that point out that Finland has a high incidence of dementia because of environmental factors - presence of neurotoxic mycotoxin in indoor moulds. low selenium levels in the soil, high methyl mercury levels in the water, and cyanobacteria that cause neurotoxins in the water. Take your pick - none of them easy to solve.
