Earlier this week, it introduced milk and fruit cup options for its Kids' Meal and is testing combo meals that offer chili, baked potatoes or a side salad instead of French fries, and "carb counter" meals.

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The meal would have to contain half a cup of fruit and three-fourths a cup of vegetables, and offer less than 640 milligrams of sodium and less than 0.5 milligrams of trans fat.

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But as the participants walked down the hallway, there were refreshments available with a choice of a decadent chocolate cake, or a cup of fresh fruit.

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All meals (except breakfast) must also contain a half-cup of vegetables and fruit.

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