Its effectiveness is supported by anecdote only – there is no evidence of its worth as a cancer treatment.[28] Superfood – a marketing term applied to certain foods with supposed health-giving properties. Cancer Research UK note that superfoods are often promoted as having an ability to prevent or cure diseases, including cancer; they caution, "a healthy, balanced and varied diet can help to reduce the risk of cancer but it is unlikely that any single food will make a major difference on its own."[29]