Both orange juice and grapefruit juice are healthy drinks that are rich in vitamins and minerals, so combining them can be particularly beneficial. Orange juice and grapefruit juice are rich sources of carbohydrates, and both are fat-free. Although orange juice and grapefruit juice are not appropriate for low-sugar diets, they do offer some other nutritional benefits.
If you want to gain weight, drinking orange juice and grapefruit juice together can be beneficial. One cup of orange juice and one cup of grapefruit juice together provide 208 calories, which comprises more than 10 percent of the daily suggested intake of 2,000. In addition, research from the May 2007 edition of "Hormone and Metabolic Research" indicates that liquids are less filling than solid foods, so these juices can be highly effective for weight gain.
Both grapefruit and orange juice are high in carbohydrates; drinking one cup of each would provide a total of 49 g of carbohydrates. Carbohydrates are your body's primary fuel source, so drinking orange juice and grapefruit juice can help give you energy for exercise and other activities.
Drinking orange juice and grapefruit juice together is beneficial because both are rich in vitamin C. Vitamin C is an antioxidant, meaning that it protects your body from oxidative stress, which can damage your cells. Vitamin C also helps create scar tissue, heal wounds and maintain the integrity of your bones and cartilage.
If you want to increase your potassium intake, drinking grapefruit and orange juice together can be highly beneficial. Drinking one cup of each juice provides nearly 45 percent of the daily suggested intake of potassium. This nutrient is an electrolyte and helps promote proper nerve and muscle function.
Combining grapefruit and orange juice can help you increase your intake of vitamin A. While orange juice is relatively low in vitamin A, one cup of grapefruit juice contains about 120 percent of the daily suggested intake of the vitamin. It's important to consume adequate levels of vitamin A because it supports healthy vision and immune system function.