And "what finding" would that be? Especially, if there's no effort to establish min safe exposure levels or QUANTIFY the exact risk for Alzheimers and the other "postulated" outcomes?
No findings -- no "accepted" science. Just gathering empirical evidence on "causality" and attempting to identify the possible "vector sources" for the theory.
Did ya go the WebMD site? Probably not..
Controversial Claims About the Causes of Alzheimer's Disease
One of the most publicized and controversial theories concerns aluminum, which became a suspect in Alzheimer's disease when researchers found traces of this metal in the brains of patients with Alzheimer's disease. Many studies since then have either not been able to confirm this finding or have had questionable results.
Aluminum does turn up in higher amounts than normal in some autopsy studies of Alzheimer's patients, but not in all. Further doubt about the importance of aluminum stems from the possibility that the aluminum found in some studies did not all come from the brain tissues being studied. Instead, some could have come from the special substances used in the laboratory to study brain tissue.
Aluminum is a common element in the Earth's crust and is found in small amounts in numerous household products and in many foods. As a result, there have been fears that aluminum in the diet or absorbed in other ways could be a factor in Alzheimer's. One study found that people who used antiperspirants and antacids containing aluminum had a higher risk of developing Alzheimer's. Others have also reported an association between aluminum exposure and Alzheimer's disease.
On the other hand, various studies have found that groups of people exposed to high levels of aluminum do not have an increased risk. Moreover, aluminum in cooking utensils does not get into food, and the aluminum that does occur naturally in some foods, such as potatoes, is not absorbed well by the body. On the whole, scientists can say only that it is still uncertain whether exposure to aluminum plays a role in Alzheimer's disease.
http://www.alz.org/alzwa/documents/alzwa_resource_ad_fs_aluminum.pdf
Does aluminum play a role in causing
Alzheimer’s disease?
Thinking about whether aluminum plays any role in
Alzheimer’s disease has evolved over the 40 years that
researchers have been exploring this question. The theory
that aluminum might be involved emerged in the 1960s
after scientists discovered that exposing rabbits’ brains to
aluminum caused nerve cell damage with some similarity to
Alzheimer pathology. Physicians also noted that people
undergoing long-term dialysis sometimes develop a nonAlzheimer
form of dementia caused by a buildup of
aluminum in the bloodstream. These observations raised
the specter that aluminum might be one of the first
substances implicated in triggering Alzheimer’s.
However, studies since then have failed to document a
clear role for aluminum in causing Alzheimer’s. Every
perspective from which researchers have explored the
question has yielded contradictory data. For virtually every
study suggesting that aluminum may be linked to
Alzheimer’s, there is another study failing to confirm
those results.
The vast majority of mainstream scientists now believe that
if aluminum plays any role at all in Alzheimer’s, that role is
small. If aluminum exposure had a major impact on risk,
scientists would have gained a clearer picture of its
involvement over the decades that they have been studying
the issue, even though certain factors hamper research. One
such issue lies in the widespread occurrence of both
aluminum and Alzheimer’s, which complicates the effort to
characterize their relationship. Aluminum is Earth’s third
most common element after oxygen and silicon, and
Alzheimer’s occurs frequently in older adults.
.........
Further, it is unlikely that people can significantly reduce their exposure to aluminum through such measures as avoiding aluminum-containing cookware, foil, beverage cans, medications and other products. Even if aluminum were clearly implicated in Alzheimer’s, these routes of exposure account for only a small percentage of the average person’s intake.
I've got another source on this -- my daughter, who has worked in 2 of the top US research labs on Alzheimer's in the past few years. And we've had long discussions about the "elevated number" and enviro issues. And there's a LOT of theories. But not a lot of "settled or "consensus" science on this theory about metals.
Not even CONSENSUS science at this point. Not likely to BE SETTLED science in the near future.