The best way to get your full range of vitamins and minerals is to eat a healthy, balanced diet with a wide variety of fruit and vegetables, and this can help protect against cancer.

Eating these things is not proven to stop you getting cancer or improve your eyesight, but as part of a varied and balanced diet, they may do you some good.

Dietary approaches have traditionally been thought to be limited to cancer prevention, but this demonstrated it could help slow the growth of existing tumors.