From BBC News
Short-sightedness could be linked to childhood over-consumption of bread, rather than holding books too close, researchers suggest.
Scientists say diets high in refined starches, such as breads and cereals increase insulin levels in children.
This, they say, may then affect the development of the eyeball.
The theory put forward by the researchers from Colorado State University in Fort Collins, and the University of Sydney is that the excess hormone makes the eyeball abnormally long and causes short-sightedness.