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Citrus - the healthiest juice

According to a study from the University of Florida 100% pure orange juice and ruby red grapefruit had better "nutrient profiles" than other common fruit juices, including apple, grape, pineapple and prune.

"Fruit juices vary considerably in the quantity of nutrients per calorie," author Gail Rampersaud writes in the latest issue of the Journal of Food Science.

"The study uncovered just how much better the nutrient profiles of 100% grapefruit and orange juice are than other commonly consumed fruit juices."

Key constituents in providing health benefits include vitamin C, which as an antioxidant "works to neutralise free radicals to help fight cell and tissue damage that could lead to diseases".

Potassium is said to benefit cardiovascular health, while folate in orange juice is associated with reducing the risk of certain birth defects and "may help lower homocysteine levels in the body".

Vitamin A, thiamin and phosphorous were also said to benefit the health.

According to the findings, pink grapefruit juice had the highest "nutrient density", orange juice ranked second and white grapefruit juice came third.