Reading the nutrition facts label of products is the best way to understand this.

阅读食品包装标签上的营养成分说明是最好的了解方式。

This week, the First Lady announced new food nutrition labels and rules to reduce marketing of less-healthful food in schools.

本周，第一夫人宣布了新型食物营养标签，以此减少不健康食品在校园中的销售。