Once an offending food group is isolated, the same approach can be applied to single items of the same group, although in some - but not all cases, an entire food group may be responsible for causing headaches. Keeping an accurate diary is most important to not only help isolate any problem foods, but also additives such as sulfites, MSG, nitrites nitrates, or other common offenders such as caffeine or tyramine, and to not miss any possible non food-related triggers such as lack of sleep or sleeping in too long, exposure to electromagnetic fields, fresh news print, eye strain, pet allergies, and an intolerance of natural nutritional remedies, supplements, or prescribed medications... Full Text