My understanding: Aluminum exists naturally in soil and is absorbed into plants and the animals that eat them. We have always been exposed aluminum in trace am

My understanding: Aluminum exists naturally in soil and is absorbed into plants and the animals that eat them. We have always been exposed aluminum in trace amounts via food. Ones total exposure increases over their lifetime. Over a century ago aluminum extraction became much cheaper and it started to be used in various food additives, thereby increasing the amount of aluminum we consume and the average total exposure over our lifetimes. If aluminum is a primary factor in Alzheimer's, we would see an increase in incidence over that time period as well.