Headache can varies from a regular headache to clusterheadache or migraine. If we talk about 'normal' headaches I am convinced that having a balanced diet and sleep can prevent the cause of having an headache. Because for me personnaly when i feel that my head hurts, it's mostly because I didn't sleep well or I didn't consume enough drink or food. ^^
I also don't like the idea of taking to much medicins.