I am pretty slow to cut people off, I think, but it just got too much to deal with. She's not really a good friend, just someone I run into here and there and we chat. We used to have more in common when I was a vegetarian. Since then, diet discussions have been made off limits. Forget politics, even though we share similar views on most points. Oh, and Atkins is dead and he died fat and with heart disease because that is what she read on the internet.
I have seen her go ballistic with other people, too, including her very sick, footless diabetic friend, and decided that I had just had enough.
I remembered Peter Dee's post with his link to a youtube video concerning vitamin B12. I think many of the symptoms fit her to a T. Then I felt a little bit more compassion for her illness until I caught myself. It has always been her choice.
Maybe it is not B12, maybe it is protein. Another friend did some yardwork for her once, and she said, "Hey, I'll buy you lunch." When lunchtime came around, she went to the store and bought a granola bar and a Diet Coke. Poor thing! (I mean the gardener!)