It's based on avoiding sugar and grain products.

这是基于避免糖和谷物产品。

Choose whole grain foods over processed grain products.

选择全谷物食品、全麦类食物。

You need to eat at least 4 servings of grain products every day.

你需要每天吃至少4份谷类食品。

Enriched breads, cereals and other grain products also contain it.

强化维生素面包、谷类和其他谷物产品，也含有叶酸。

Grain products provide carbohydrates, your body's main source of energy.

谷类食物可以提供碳水化合物，这是您身体能量的源泉。