oil is calorie dense. vinegar is not though. I usually gets subs with vinegar. The thing that is nice about subway is that you can load up on veggies which provide a nice spectrum of food sources while having a small impact on calories. Like SC says though. Avoid bacon, mayonnaise, oil, etc and you'll be fine. Never realizes that mustard is bad. read up on it. honey mustard is bad at 30 cals per tablespoon. But mustard seems to be in the sub 20 calorie range per tablespoon.