My husband and I tracked his eating habits to try to work out if there was a link, and given we ate what we thought was healthy home cooked organic(where we could afford it) food we really were quite perplexed
What the book explained was that sulphites can be hidden and undeclared so we were going from one type of food to another yet he was still eating sulphites cause they were income of the food choices one being the maize flour we used to thicken our gravies. Since he went off ALL sulphites it has been like night and day for him.
I think if you start with the food journal that at least helps you get conscious of what you eat, just remember to look at thickeners, stock powders/cubes. Even the supposed healthy range of gluten free can be loaded with sulphites.
I live with the thought "if you can't read whats on the ingredients then don't eat it"