New York: Scientists have discovered that multiple rounds of heating left-over spaghetti bolognese with extra oil has extra health benefits.

The technique alters the structure of the main antioxidant in tomotoes – lycopene so that it is more easily absorbed into the body.Previous studies have already shown that making raw tomatoes into purees or sauces increased the benefits.

Study leader Dr Steven Schwartz, from Ohio State University in Columbus, told fellow scientists at the American Chemical Society in Philadelphia.’What we have found is we can take the red tomato molecular form of lycopene and by processing it and heating it in combination with added oil, we can change the shape of the molecule so it is configured in this bent form.’

Heat is vital to the process, but so is the addition of some fat, which helps carry the lycopene through the gut walls.

The scientists processed red tomatoes into two kinds of sauce. One was rich in cislycopene – the ‘bent’ variety – while the other mostly contained all-trans-lycopene, the linear form.

A small study was then conducted on 12 volunteers who were given both types of sauce to eat. After each meal, blood samples-were taken and analysed over nine and a half hours. Lycopene blood levels were 55 per cent higher after consumption of the new sauce, the scientists found.