Grapefruit is known to be a low calorie fruit with great nutritional value. You may consume grapefruit in its raw form or have grapefruit juice. However, the calorie content in both these forms differs. A medium sized raw grapefruit contains around 73.6 calories out of which only 1.9 calories come from fat. The total fat content in an equal sized grapefruit is 0.23 gram of which 0.03 gram is saturated fat and 0.06 gram polyunsaturated fat. The total Potassium content in it is 319.7 mg, Protein content is 1.45 grams, Carbohydrate content is 18.58 grams and Dietary Fiber content is 2.5 grams.
Grapefruit is also quite rich in Vitamin C and a good source of Vitamin A. It also contains other micronutrients such as Calcium, Iron Niacin, Thiamin, Riboflavin, Vitamin E, Vitamin B6, Phosphorus, Manganese, Copper, Magnesium, Zinc and Selenium in moderate amounts.
The calorie content in grapefruit juice is different from raw grapefruit. One cup serving of grapefruit that weighs around 247 grams contains approximately 96 calories out of which only two calories come from fat. The total fat content in grapefruit is 0.2 grams out of which 0.1 grams come from Fat. The sodium content in an equal quantity of grapefruit juice is 2 mg, total carbohydrates content is 22.7 grams and protein content is 1.2 grams. The Vitamin C and Vitamin A content is quite rich in the juiced form as well.
The calorie content in 100 grams of canned, unsweetened grapefruit juice is 38 kcal. An equal quantity of canned unsweetened grapefruit juice contains 0.5 gram of protein and 0.1 gram of fat. While 100 grams of canned sweetened grapefruit juice has 46 calories. It has 0.6 gram of protein and 0.1 gram of fat. 100 grams of unsweetened frozen concentrate of grapefruit juice contains 146 kcal. An equal quantity of similarly packed grapefruit juice contains 2 grams of proteins and 0.5 gram of fat.