A study done by scientists at the University of Glasgow in Scotland shows that purple grape has the biggest benefits in preventing heart disease, Alzheimer's disease and a host of other chronic ailments.

All juices contain chemical compounds known as polyphenols. They are antioxidants help remove harmful free radicals from the body.
The scientists decided to look at the antioxidant content of various juices.

They chose 13 different brands of fruit juices from a local U.K.
supermarket and measured the number and levels of antioxidants in apple, orange, grapefruit, cranberry, pineapple, tomato and grape juice. The study results showed that purple grape juice had the highest concentration of antioxidants among juices while the most popular orange and clear apple juice had the lowest antioxidant content.

The study author, professor Alan Crozier, reported that when it comes to antioxidant levels, there is no difference between juice made from concentrate and freshly-squeezed juice. What it matters is types of fruits used. He stressed that purple grapes, cranberries and pomegranates are healthier and do more to protect us from diseases than oranges and pineapples.

Other scientists believe that professor Alan Crozier is just promoting new purple grape juice made by the National Grape Co-operative, a consortium of U.S. farmers owned by Welch's, who had funded the study.
Professor Crozier denied these accusations and confirmed that purple grape juice really does have a high concentration of antioxidants and that his study is not promoting Welch's new healthy juices like cranberry and pomegranate.

Crozier is promoting a variety in both nutrition and beverages. He says we should try having a glass of purple grape one day, cranberry the next, and even a glass of red wine would be good. Orange juices are also beneficial as they, just like grapefruit, contain flavanoids - a type of antioxidant found in citrus fruit only.