This is the 1854th most frequent Korean word.
건강에
"건강에" means "to health" or "for health" in English.
The word "건강에" is used to indicate the target or focus of importance, relating to health.
운동은 건강에 아주 중요합니다.
Exercise is very important for health.
Here, "건강에" specifies the action of eating food that supports or improves health.
건강에 좋은 음식을 먹어야 합니다.
You should eat food that is good for health.
In this sentence, "건강에" denotes the object affected or influenced, in this case, health.