Discovered: The 'fat controller' in the body that is the key to staying slim

A 'fat controller' in the gut could be the key to preventing obesity, diabetes and heart disease, research suggests.

Scientists have pinpointed an enzyme that determines whether the fat we eat is burnt off as energy or stored in the body.

The breakthrough raises the prospect of a pill being developed which targets the enzyme in people, allowing them to eat without worrying about putting on weight.