I tried to find a citation and it was sort of mixed in terms of results -- it doesn't seem like it is the primary cause of it dropping across the board: https:

I tried to find a citation and it was sort of mixed in terms of results -- it doesn't seem like it is the primary cause of it dropping across the board: https://www.jpost.com/health-and-wellness/article-745766 https://www.jpost.com/health-and-wellness/article-745766