The anti-cancer properties of carrots are more potent if the vegetable is not cut up before cooking, research shows.
Scientists found "boiled before cut" carrots contained 25% more of the anti-cancer compound falcarinol than those chopped up first.
Experiments on rats fed falcarinol have shown they develop fewer tumours.
The Newcastle University study will be presented at NutrEvent, a conference on nutrition and health, to be held in France.
Lead researcher Dr Kirsten Brandt, from Newcastle University's School of Agriculture, Food and Rural Development, said: "Chopping up your carrots increases the surface area so more of the nutrients leach out into the water while they are cooked.
"By keeping them whole and chopping them up afterwards you are locking in nutrients and the taste, so the carrot is better for you all round."
The Newcastle scientist, along with colleagues at the University of Denmark, discovered the health benefits of falcarinol in carrots four years ago.
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