Are you a meat eater? If you can find a good deal on organic meat (organic is by far the best!) then that would be good... its quite good to invest ina slow cooker. THen you can put your meals together in the morning (or night before even) and turn it on so it cooks all day and you come home to a nice hot meal. If you make enough you can have it for lunch the next day and freeze some for a future dinner.
Keep breakfasts and lunches nice and light like you're doing and concentrate on dinner. If you're busy then its easier to concentrate on the one meal being more substantial than the rest. For lunch take things like carrot sticks, a boiled egg, a lettuce salad with some cheese, natural unsweetened yoghurt with berries... that kinda thing. Nice light protein with some veggies
