I'm sorry this is off topic as far as low carb is concerned by it is related to Alzheimer's and people interested in reducing the risk of dementia really need information on all possible approaches.

Residence Near Power Lines and Mortality From Neurodegenerative Diseases: Longitudinal Study of the Swiss Population.
The relation between residential magnetic field exposure from power lines and mortality from neurodegenerative conditions was analyzed among 4.7 million persons of the Swiss National Cohort (linking mortality and census data), covering the period 2000-2005. Cox proportional hazard models were used to analyze the relation of living in the proximity of 220-380 kV power lines and the risk of death from neurodegenerative diseases, with adjustment for a range of potential confounders. Overall, the adjusted hazard ratio for Alzheimer's disease in persons living within 50 m of a 220-380 kV power line was 1.24 (95% confidence interval (CI): 0.80, 1.92) compared with persons who lived at a distance of 600 m or more. There was a dose-response relation with respect to years of residence in the immediate vicinity of power lines and Alzheimer's disease: Persons living at least 5 years within 50 m had an adjusted hazard ratio of 1.51 (95% CI: 0.91, 2.51), increasing to 1.78 (95% CI: 1.07, 2.96) with at least 10 years and to 2.00 (95% CI: 1.21, 3.33) with at least 15 years. The pattern was similar for senile dementia. There was little evidence for an increased risk of amyotrophic lateral sclerosis, Parkinson's disease, or multiple sclerosis.

For those who find research findings difficult to understand, this study of the 4.7million Swiss population, reports that those who live within 50 meters of a 220-380 kV power lines power line have double the risk of Alzheimer's if they stay there for more than 15yrs.

Even 5yrs living in close proximity to a power cable increases the risk of Alzheimer's and dementia significantly compared to those who live 600 mts or more away.

12/11/2008 - Living close to a powerline can double your chance of dying from Alzheimer's Disease This Powerwatch article is a reasonably informed discussion of the findings. From it I quote Professor Matthias Egger also warned that sleeping in power-frequency magnetic fields from any source probably presents a dementia risk. He said: "Anything that is plugged in and that is on all the time and that is near to your body is a source of EMF".

There may be a solution though