yes, and can cause low blood suger that can damage the brain. She may not have had a heart attack initially I surmise.
She suffered cardiac arrest, not a heart attacks.
The entire history is here, the Wolfson report which is generally considered the most comprehensive history of the entire matter. He was one of her four guardian ad litems and was trusted by both parties.
http://freerepublic.com/focus/f-backroom/1370047/posts?page=1264#1264