So Bec, I have been thinking...following various circumstances involving food poisoning i have come up with the following theory!
I have realised that the only times i (and many fellow travellers) have been sick has been when i have eaten at restaurants...we have the veggie spring roll ordeal in Sapa last year and Kaz and i had the killer seafood in Koh Chang, Thailand.
This trip i have been mainly eating at food stalls in markets and roadside and never been sick (not including the koh chang prawns of death).
my theory goes as follows: The restaurant is more likely to carry bacteria and have cross comination due to the fact that it isn't packed up, cleaned and moved everyday like food stalls. Also you can't see how they cook the food or how the food is stored! The food at stalls is fresh everyday because there aint no fridges!
So far my theory has proved me right, though i won't hold my breath! ;)