This is the 12304th most frequent Korean word.
단백질이
"단백질이" means "protein is" in English.
In this sentence, '단백질이' is used as the subject referring to 'protein,' which is described as being abundant in certain foods.
단백질이 풍부한 음식은 건강에 좋습니다.
Foods rich in protein are good for your health.
Here, '단백질이' is once again the subject, but this time it refers to the absence or lack of protein, affecting muscle development.
단백질이 부족하면 근육 발달에 문제가 생길 수 있습니다.
If you lack protein, there could be issues with muscle development.
In this instance, '단백질이' precedes the verb '포함된', emphasizing the inclusion of protein in a diet as being important.