A glass of purple grape juice a day could leave you feeling in the pink. It is the most effective of all fruit juices at preventing heart disease and cancer, says a latest study.

It has long been known that fruits contain antioxidants called polyphenols which help to neutralise unstable oxygen molecules called free radicals. If left unchecked, these molecules can harm cells, playing a role in everything from ageing to cancer.

Generally, the darker juices were best, with purple grapes having the highest levels of polyphenols, the researchers said that