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Why you just had to have that extra slice of pizza

By Catherine Zandonella

22 September 2001

IF YOU think you eat too much and at the wrong times, you can stop fretting.
Your dining habits are governed by your genes, a study of identical and
fraternal twins has revealed.

“Changing these factors is equivalent to trying to change one’s breathing,”
says John de Castro, a behavioural scientist at Georgia State University in
Atlanta.

He reasoned that if genes exert a strong influence on eating patterns, adult
identical twins would have very similar dining preferences even if they live
apart. Such similarities would be less common in fraternal twins, who do not
share identical genes.

To test…

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