Researchers from the Quadram Institute and John Innes Centre want to study whether the soup, containing biofortified tomatoes grown in Norwich, can boost levels of vitamin D - nicknamed the sunshine vitamin.

They need 76 participants with low vitamin D levels, aged over 18 and living within 40 miles of Norwich to eat a portion of tomato soup daily for three weeks.

The ViTaL-D study will explore whether consuming the soup leads to higher levels of vitamin D in the blood after people have eaten it.

If successful, it would be a step towards using the biofortified gene-edited tomatoes, which were developed at the John........

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