Honey and all natural sugars do nothing to cause any agitation in my family. I have been on a honey kick lately, and have no headache problems.
HFCS is a chemical man-made mixture that chemist university professors have personally warned us about, and told us not to consume. It is known to cause brain damage and kidney damage. Since it is a chemical mixture that is man-made and not natural, our bodies have trouble recognizing it for sugar.
High Fructose Corn Syrup: Some Scary Facts to Consider Before You Gulp Down Soda
http://www.freerepublic.com/focus/f-chat/3002048/posts
5 Reasons High Fructose Corn Syrup Will Kill You
http://www.freerepublic.com/focus/f-news/2723427/posts
Also, to those who wish to avoid HFCS. They have been changing the name of it to hide it in ingredients. ex: corn sugar.