Each patient is unique. Allergy tests are frequently negative. Ingredients high in histamine or other vaso-active amines can be the primary cause. Lectins in foods can cause release of cellular amines. Vascular headaches are very frequently affected by delayed reactions.
Caffeine withdrawal can cause headache.
There are so many possibilities, that it makes especially good sense to let the computerized analysis figure it all out. More symptoms or WDL Home Page Diarrhea Loose stools, frequent defecation, urgency and diarrhea are frequently due to food reactions. Irritable bowel syndrome is commonly caused by food reactions. Spastic colitis is similar. The reasons are many.