WASHINGTON (AP) - It was back-to-school day for Michelle Obama on Wednesday.

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The first lady dropped in for lunch and circle time at a preschool at a multicultural center in Washington to announce that 1,600 child care centers nationwide will commit to encouraging healthy eating, exercise and limited time in front of TV, computer and other screens.

The centers are run by the Defense Department, the General Services Administration and Bright Horizons, which manages child care centers for many corporations, hospitals, universities and government agencies.

Mrs. Obama also released a checklist that parents can use to encourage the healthy behaviors.