Although it is believed by some people that eating chocolate is a cause of migraines , this belief lacks a reliable scientific basis [1,2] .

1.  Lippi G, Mattiuzzi C, Cervellin G. “Chocolate and migraine: the history of an ambiguous association”. Acta Biomed. 2014 Dec 17;85(3):216-21. Review
2. Marcus DA, Scharff L, Turk D, Gourley LM. “A double-blind provocative study of chocolate as a trigger of headache”. Cephalalgia. 1997 Dec; 17(8):855-62; discussion 800.