许多快餐缺乏必要的营养价值。

Many fast foods lack essential ___nutritional benefits.

选择新鲜食材是保持营养饮食的关键。

Choosing fresh ingredients is key to maintaining a ___nutritional diet.

专家们经常争论有机和传统农产品的营养差异。

Experts often debate the ___nutritional differences between organic and conventional produce.