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A new study shows that kids who bring a bag lunch to school aren't necessarily getting a healthy meal.

Researchers at Tufts University found less than one-third of packed lunches meet government standards for school cafeteria meals.

Only a quarter of the lunches included a primary entree like a sandwich, and most of these lacked protein, like yogurt, cheese or peanut butter. One in four children also brought sugar-sweetened beverages, and only a third brought fruit.

Experts said parents tend to pack a lot of pre-packaged foods because they're convenient and don't need refrigeration.

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