Anything that is not deep friend or mass produced. Fruit, veggies, etc. However, I do snack on crackers and cheese which does not quite fit into the health department...and to equal the odds I add some tomato in there somewhere! LOL
I find it hard to go past yoghurt. A good organic one, you can have it plain, with fruit or with muesli. Sometimes satisfies a sweet craving too, but I won't say it always does because there are occasions when nothing but a piece of chocolate will do!