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What if you could reach a great age through your dietary choices? Imagine 鈥� that the food you eat has a direct effect on how long you live. An appealing concept, but can it be backed up by research?

In this programme, Ruth Alexander explores the dietary habits of centenarians, to find out if there are any similarities in what they eat and whether their diets have had a bearing on their longevity.

She speaks to 100-year-old Betty Webb, to find out how much food has played a role in reaching a century, and discovers more about 鈥淏lue Zones鈥� 鈥� geographical areas where some researchers claim people live longer than average lifespans.

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk

(Picture: An older woman holding a slice of watermelon. Credit: Getty Images/麻豆官网首页入口)

Producer: Elisabeth Mahy