체질에 잘 맞나 봐 은 무슨 뜻인가요?

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simply it means some kind of supplements or food is perfect fit for your body and health condition.
To go into detail, in the 19th Century, the scholar Yi Je-ma founded the study of Sasang medicine, which was defined as constitution-type medicine. It categorizes human race into 4 different types and each has its own advantages and disadvantages that certain type of food matches or not.