Nutrition terms for foreigners in Korea

Korean English
열량 or 칼로리 Calories
탄수화물 Carbohydrate
당류 or 설탕 Sugar
단백질 Protein
지방 Fat
포화지방 Saturated fat
트랜스지방 Trans fat
콜레스테롤 Cholesterol
나트륨 Sodium
비타민 Vitamin
칼슘 Calcium
철분 Iron
유당 Lactose
구연산 Citric Acid
Juice (as is how much of that grape-flavored product is really grape juice)
Quantity of something
제공량 Serving size
총약 Total number of servings
1회 제공량당 함량 1 serving of this food contains…
총 2회 제공량 2 servings total
봉지 A package (for ramen or cookies or things that come in packages)
조각 Piece / Slice / Strip / … (as in a slice of pizza or a piece of cake)
유통기간 Expiration date
원료명 or 원재료명 Ingredients

Source: Life in Korea: decoding Korean nutritional labels