Freshly squeezed grapefruit juice is a nutritious way to start your day. This citrus fruit contains no fat, cholesterol or sodium and packs a high amount of vitamin C, vitamin A and the antioxidant lycopene. Grapefruit is also naturally tart, however, and its juice may taste quite sour. Combine your grapefruit juice with other fresh fruit or vegetable juices, or sweeten it with a touch of natural sweetener.
Juice naturally sweet vegetables such as beetroot or carrots. Sweeten your freshly squeezed grapefruit juice with a cup of vegetable juice. Stanford Medicine notes that a cup of carrot juice provides the same nutrients found in 5 cups of the chopped carrots.
Mix in a tablespoon berry puree to your grapefruit juice. Smoothly blended blueberries, raspberries or strawberries add natural sweetness, essential fiber, vitamins, minerals and antioxidants.
Add a small amount of natural sweetener. The Cleveland Clinic recommends agave nectar, a naturally sweet plant extract. Or add stevia, a leaf extract that is sweeter than sugar but does not raise your blood sugar levels.