Just found this - of course there is a huge amount of info on the net, but this summed up what I was trying to say. (I have an "attack" around once every 3 to 4 weeks, so it's not too bad!

The first basic treatment is to avoid all foods that contain elemental sugar. This includes almost all desserts and junk foods. (Actually that wouldn't be so bad for a "healthy" person would it?) It also includes all non diet soft drinks. A lot of people find that caffeine also stimulates the release of blood glucose and precipitates a reaction. That is the reason why caffeine helps keep people awake and "gives" them energy, it's really the increase in blood glucose giving them the extra energy. Beware of anything that comes in a box from the supermarket. The food industry loves to add sugar to things to entice you to eat their products. The worst offender you can think of are breakfast cereals. They not only put sugar in their product, but on their product. The cereal that I have ended up with is Shredded Wheat, which has no added sugar.

The second basic treatment is to give your body small doses of food at more frequent times during the day (the frequency people use varies from 6 times a day up to 11 or 12 times a day). These snacks should, of course, be smaller portions of things which are digested slowly. Things that are digested slowly include protein and complex carbohydrates. For comparison, simple carbohydrates are include things like sugar. Complex carbohydrates include whole grains and fresh vegetables. Beware of everything that has ingredients that end in -ose, which denotes a sugar. These include dextrose, glucose, maltose, sucrose, sorbital. Fruits are sort of in a gray area, with their fructose. If you have a fruit drink, such as apple juice, then the sugars can be absorbed quickly. If you have applesauce, then the body has to do some breaking down of the applesauce before it can get to the sugar. If you have a whole apple, then the body has a lot of breaking down to do. You have to read labels to see if the products have sugar in them