Girls miss out on milk
The crippling bone disease also affects one in 12 men and is largely preventable by sensible eating and physical exercise during school years. Bone intensity is at its peak growth during puberty. By the age of 17, girls have 91 per cent of their bone density. The popularity of school vending machines that sell fizzy drinks is said to exacerbate the problem.
"A glass of milk a day would provide 250 milligrams of calcium. Girls should also be taking more exercise and strengthening their bones and getting vitamin D from being outside taking part in activity," Dr Buttriss advised.
Fruit and vegetables are also a valuable sources of calcium.