They were investigating the impact of lycopene – a bright red chemical found in tomatoes, peppers and water-melons.
A study of 1,031 men, published in the journal Neurology, showed those with the most lycopene in their bloodstream were the least likely to have a stroke.
The Stroke Association called for more research into why lycopene seemed to have this effect.
The levels of lycopene in the blood were assessed at the beginning of the study, which then followed the men for the next 12 years.
They were split into four groups based on the amount of lycopene in their blood.
There were 25 strokes in the 258 men in the low lycopene group and 11 strokes out of the 259 men in the high lycopene group.
The study said the risk of stroke was cut by 55% by having a diet rich in lycopene.
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