I purchased a large calendar (has the whole month on each page) and write all info on it. If I wake up with a migraine, I write down what I had for supper the night before. I do the same if I develop a migraine during the day. I write down not only food but types of OTC pills or sumatriptan. I highlight in yellow if I took a sumatriptan. You can usually see a pattern of what triggers a migraine. Sometimes a strong smell or odor triggers them, I write that down too. At the end of the month, you'll see foods that are likely to trigger migraines.