> Can anyone shed more light on the topic? Are there some foods which are
> known to cause immediate vs. delayed reactions?

I have always thought that it the amount of concentrated milk products in
what I am eating.  Like I can feel my stomach turn asap by eating one m&m
but I can eat something that doesn't have much milk (or whey or someother
byproduct)  per square inch of food and it not really affect me.  I guess
it something you have to figure out what makes you sick.

Sarah