营养在马拉松的表现和恢复中起着关键作用。

___Nutrition plays a key role in marathon performance and recovery.

均衡的营养对保持健康非常重要。

Balanced ___nutrition is very important for maintaining good health.

他在大学里主修营养学，专注于研究食物如何影响人体健康。

He majored in ___nutrition at university, focusing on how food affects human health.