Research Methods Used and Some Answers to the Question: Does Chocolate Cause Headaches?

To find out if chocolate caused headaches I did a search on Google, which is a search engine. By inputting 'headaches and chocolate' it gave me quite a few websites which had very interesting information on them. However, some links to the websites which Google listed did not work, and other sites were of no use as they provided irrelevant information. I also searched for newspaper articles through Google, and this too brought back many helpful sites to explore.
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