How much are our genes to blame for obesity?

A new study involving twins aims to help explain why we eat what we eat - and what impact it has on our waistline, writes Clodagh Finn.

DID you ever wonder why some people eat whatever takes their fancy yet never gain an ounce, while others appear to be built for comfort rather than speed?

It’s her “fast metabolism”, we reasoned, or his “big bones”. And we might not have been entirely wrong.