So tonight I was eating a bowl of ice cream (made in my very own ice cream machine) and got to thinking about ice cream headaches. Specifically, I was wondering if they were caused by blood sugar fluctuations (and actually tried to give myself an ice cream headache to see if my sugar-free ice cream would even do it – it did). Went to Google, and I have my answer. Ice cream headaches have absolutely nothing to do with blood sugar. This site has a good explanation, or if you’re not afraid of technical language, and want a more thorough explanation, try this site.