Low blood sugar, or glucose, is sometimes responsible for triggering or exacerbating migraines and other types of headaches. The brain requires a continuous source of glucose from the blood, and if glucose levels drop the brain is one of the first organs affected, states The Migraine Trust.
Fasting, eating high-sugar foods, dieting too rigorously and skipping meals all possibly trigger headaches or migraines, says The Migraine Trust. Even delayed or irregular meals are problematic because these sometimes cause glucose levels to fall too low. Headaches produced from going without food are often quite severe and accompanied by mild nausea. Some of the symptoms of missing a meal and the early warning signs of a migraine are the same, including pallor and mood changes.
If migraines appear to be triggered or worsened by low glucose levels, it is possible to keep them under control by paying close attention to diet. Small, frequent, low-sugar meals are helpful. It is important never to miss breakfast or to skip meals. Small, high-fiber snacks between meals keep sugar levels from getting too low. Eating a healthy cereal before going to sleep potentially helps with headaches by preventing blood sugars from getting too low while sleeping.