I use those packets of flavoured cous cous. I cook it & let it cool, then add chopped tomatoes, spring onions, cucumber, radishes, olives, capers... etc I add a couple of Quorn sausages cooked & chopped up small & stir it all together. This does at least 2 lunches & is very low fat. Once I have eaten a serving of that, I can't manage crisps / chocolate etc.
Other nice things are crispbreads with cottage cheese, rice salads, fruit salad is always good if you need something sweet to finish!