Hi Christine,
My husband and two of our daughters (both adults, one named Christine!) run marathons in the Zone and have never carb loaded. Christine's also run the Hood to Coast team relay (about 200 miles) and is doing it again next summer. Here’s a short Q&A Barry Sears answered about carb loading before marathons: http://www.drsears.com/tabId/399/it...truth.aspx
Also, one of the forum members here, Martha, is a marathon runner from Belgium who has made remarkable progress running marathons in the Zone. She finished the NY Marathon last fall in 3:17. Here are some of her postings. You can find more by doing a Zone forums search using “Posted By” and the username ADELA00
Re 2009 NY Marathon
http://www.zonediet.com/Community/Forums/tabid/121/forumid/2/tpage/1/view/Topic/postid/47979/Default.aspx
Re 2008 Eindhoven Marathon (Holland)
http://www.zonediet.com/Community/Forums/tabid/121/view/topic/forumid/2/postid/29934/Default.aspx
more from Martha
http://www.zonediet.com/Community/Forums/tabid/121/view/topic/forumid/2/postid/23684/Default.aspx