I'm doing the same. Something that helps for me: Only take bad snacks in the weekends. I used to eat chips, chocolate and cookies literally every evening. Now I've changed that to the weekends and only sometimes 1 or 2 times in the evenings on monday till friday. It's really difficult to maintain it if you don't eat any bad snack at all. It's okay to eat bad snacks if you limit the amount of times of eating them.