They have discovered that lycopene, which gives tomatoes their bright red colouring, can turn sperm into super-sperm.
Researchers at the University of Portsmouth studied the effect of lycopene in the diet on a random group of six healthy men, with an average age of 42. The men were asked to consume a 400g tin of Heinz cream of tomato soup every day for two weeks.
The researchers, from the university's biomedical science department, said that during the two weeks, levels of lycopene in the men's semen rose between seven and 12 per cent, which was "significant".
They added that further studies should be carried out to discover whether the same boost would be seen in infertile men.
Nigel Dickie, a spokesman for Heinz said: "It's good to know that our tomato soup could give guys extra 'oomph'."
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