I have found that a good bowl of museli with yogart makes an excellent breakfast. Also soups are a great way of eating healthly and easily without gaining weight and keeping all the goodness in the bowl eg is you take one of each type of pepper (red/green/yellow) add an onion and a bit of mixed herds and season to taste with some water. Bring to the boil and blend. Also my personal favourite is tomato and butter bean.
I also find, going back to my roots, a wee tub of mixed, fruits, nuts etc. (you can even add the odd yogary/choc covered one for a treat) this is a healthly and energy filled snack which I always have with me and you can only put in it what you like. Sometimes with this i dont even have to eat lunch.