There are many types of headache and many things that can cause them. Some dietary triggers that can be found in fast food include salt, processed meats, nitrates, and MSG.
A study published in the journal Public Health Nutrition showed that eating commercial baked goods (doughnuts, croissants, cake) and fast food (pizza, hamburgers, hot dogs) may be linked to depression. People who eat fast food are 51 percent more likely to develop depression than those who eat little to no fast food. It was also found that the more fast food they consumed, the more likely study participants were to develop depression.