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Another mineral that can help stop a cold: Zinc. It plays a big role in immune system functioning and has been shown to stop the growth of microorganisms in the body, including some bacteria and viruses (and a virus is what causes colds). Both roast beef and whole grain bread are great sources of zinc; put them together, and you've got a powerful cold-fighting snack.
Recommended serving size: 2 ounces lean roast beef on 1 slice whole wheat bread
Calories: about 210