After being migraine-free for 9 months I have had 4 in the last week when I restarted taking chocolate slimfast shake for breakfast. Could not work out why they were happening so I googled Slimfast and migraine to see if this has happened to anyone else. After reading some of the posts here I'll bin my supply tomorrow. P S Never lost more than a couple of pounds on it...and they came very quickly back..so not a great loss..