Another huge benefit of knitting!
I was told once by a friend that also is an avid knitter that she read a study that Nun's have much lower risk of Alzheimer's. The study showed that the Nun's all had one thing in common, they were knitters. After she told me about that I thought it may be interesting to see what info I could find on the subject.
According to a study done by the Mayo Clinic in Minnesota, knitter have decreased memory loss. This decrease is quite large, between 30-50%. So if you ever get the feeling that you are wasting time knitting, think again!