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When you are on a diet to lose weight, set up a day of the week or month where you have an "off" day. On that day, allow yourself to eat that junk food you've been craving. Telling yourself you can never eat ice cream again, for example, can just lead to breaking your diet.
When trying to lose weight, it is important to remember that reducing the quantity of food consumed is just as important as replacing unhealthy foods. Healthy foods are only healthy if you eat them in moderation. Junk food isn't terrible to eat as long as you limit the amount. Moderation is key when losing weight.