If vending-machine food is the only option, registered dietitian Elisa Zied suggests choosing a granola or energy bar for breakfast, a package of nuts for a snack, tuna salad or popcorn for lunch, and some trail mix to get through the afternoon. Zied says it is important to consider portion sizes when selecting nuts or trail mix, and to watch out for high sodium and fat content in items such as popcorn or mayonnaise.

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