I want to lose weight?

Things like bread (in your sandwich) and pasta and potatoes are quite high in calories, even though they are low in fat etc. Try increasing your fresh fruit and vegetable intake, and try to eat mostly unprocessed foods. If you can, carry a snacking bag with something like carrot, cucumber, capsicum, celery pieces, so you have a snack when you want one, without resorting to something less healthy.