I have been having terrible headaches within the past year. I am 55 years old and fortunately I rarely had headaches most of my life, especially ones that have lasted for days. I am a creature of habit and so I was able to zero in on the cause after only a few months. At first I started eating Cheezits on a daily basis because I like to bring a snack to work, this is when they started. After that I was eating Colby jack cheese. I knew that some ingredient was causing the headaches but I did not figure it out right away. After I avoided these two foods for a while the headaches stopped. They started up again after I started eating instant grits with the butter flavor, no issues with regular flavor.  After comparing these three items they all contained Annatto. No headaches since - Margie USA