 People with migraines often self-report triggers for migraines involving stress or foods, or bright lights.While monosodium glutamate (MSG) is frequently reported as a dietary trigger, scientific studies do not support this claim.The Framingham Heart Study, published in 1998, surveyed 5,070 people between ages 30–62 and found that scintillating scotomas without other symptoms occurred in 1.23% of the group.