college student needs help

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I'm a college student living on campus, and sometimes it's really difficult to watch what I eat in our dining hall. I never know exact nutrition information for anything. I know people who have lost a lot of weight by cutting down their carb intake. Does anyone have any basic advice on how to avoid too many carbs when I don't know exact info, and what types of foods I can still eat? Might seem like a really basic, obvious question, but I am very new to all of this. Thanks!