Some programme I watched on TV a little a while ago said that, in a meal, you should always eat the fruit and vegetables before eating the carbohydates, meats and fats etc.
This is because fruit & veg digest faster than meats. So if you eat meats then fruits, the fruit will be staying on the top of your tummy for longer than if you eat fruits & veg first.
Anyway.. must go and grab me a chcolate bar!