Both my father and step father owned this kind of field. One steel but died in a accident young. Her cares about his workers and even mortgaged his home once when times were tough to keep them working. There were hundreds at his funeral and so many had looks of uncertainty on their faces especially the wives many with children. The other sheet metal. It’s true, no one has yet got affected although I worry more about their lungs. It’s pretty high tech now. They use computers. They only hire certified machinists which Im guessing you are too. I saw one of them on a monster car or truck show makikg some super vehicle, When times were better though they ran multi shifts. One of my brothers runs it now. But no Alzheimer’s so I just don’t know other than heavy metals aren’t good for you.
Heres something to look at. A book called the Grain brain and how gluten isn’t particulary good for you. It goes along with the Buck institute. Diet., including fat like coconut oil, olive oil Etc exercise, meditation and longer fasting times between last mean and next day’s meal. Their study at the institute all but one with advanced Alzheimer’s their memory loss was reversed and able to return to work. I just learned of it recently.