Reducing consumption of a protein found in fish and meat could slow the ageing process and increase life expectancy, according to the research.

Scientists have long believed that an ultra low calorie diet - approximately 60 per cent of normal levels - can lead to greater longevity.

But now a team of British researchers have discovered that the key to the effect is a reduction in a specific protein and not the total number of calories.

That means that by reducing foods that contain the protein - such as meat, fish and certain nuts - people should live longer without the need to cut down on meals.

Dr Matthew Piper, from the Institute of Healthy Ageing at University College London, said that a vegetarian diet could be one way to achieve the effect.

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