The vast majority of websites keep claiming that 10% of ALS is familial, and the risk factors for the other 90% are unknown.
The majority of Neurologists say that there are NO known risk factors that lead to develop ALS and there are no ways to prevent it therefore, everything that points to the contrary must be "bogus".
But, I still have my doubts that ALS is just a disease that randomly attacks anyone with no known risk factors or methods of prevention, being some of the affected ones as young as 18.
I hope one day, they (researchers) find the real cause because, without knowing the cause, the less likely will be for them to come up with a solution (a cure).
NH