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Twins, genes and size

Scientists have studied twins to work out how much our genes influence our size. They compared the height and weight of identical twins with those of non-identical twins. Both depend on diet and genes, but to different extents. Your genes do affect your adult weight, but the amount you eat is more important. Your adult height depends on how tall your parents are, although it is also affected by your diet.

Your genes influence your height and weight, but what you eat is important too.
Your genes influence your height and weight, but what you eat is important too.
Corbis

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