As I noted earlier (http://perfecthealthdiet.com/?p=86), everyone gets chronic bacterial infections; infection rates are nearly 100% in the elderly. In most people, however, the infection doesn’t progress to overt symptoms until old age.
The first symptoms, apart from loss of athleticism and energy, often appear in the brain and nerves. This is because neurons are a uniquely cozy home for bacteria. Because they cannot burn fats, neurons have high levels of the energy substrates that bacteria rely on – pyruvate, lactate, and other products of glycolysis.
Loss of memory is one of the primary symptoms of bacterial infection of the brain. I myself had a chronic bacterial infection that caused loss of memory, and my memory was recovered with antibiotic treatment. (I now, thankfully, have a 100% functional brain.) The experience persuaded me that Alzheimer’s was very likely due to a bacterial infection of the brain.
Several recent findings support that inference.
- Alzheimer’s patients almost invariably have infections of the brain and nerves. C. pneumoniae is the most common agent. Post-mortem autopsies found that C. pneumoniae infections in 17 of 19 Alzheimer’s brains, but only 1 of 19 non-Alzheimer’s elderly brains. 
- The characteristic physical feature of the Alzheimer’s brain, clumps of amyloid-beta, are plausibly the result of the brain’s antimicrobial defenses. It turns out that amyloid-beta is an antimicrobial peptide, part of the brain’s defense mechanisms against bacteria. 
These findings are consistent with a bacterial origin for Alzheimer’s. In the Alzheimer’s brain, the bacteria are parasites, stealing fuel and nutrients. This may be why the early signs of incipient Alzheimer’s are similar to the cognitive symptoms of hypoglycemia.
If Alzheimer’s is indeed caused by bacterial infection of the brain, then it is a treatable – often, curable – condition. I’ll discuss in my next post some steps that will treat and help cure Alzheimer’s.
 Balin BJ et al. Chlamydophila pneumoniae and the etiology of late-onset Alzheimer’s disease. J Alzheimers Dis. 2008 May;13(4):371-80. http://pmid.us/18487846. Hat tip Stephanie Seneff, http://stephanie-on-health.blogspot.com/2009/12/10-evidence-that-infection-is.html.
 Soscia SJ et al. The Alzheimer’s disease-associated amyloid beta-protein is an antimicrobial peptide. PLoS One. 2010 Mar 3;5(3):e9505. http://pmid.us/20209079.