I didn't know I was lacking in vitamin D until I collapsed at work

Twenty-three-year-old Saskia Reeves-Priestley was at work when she suddenly collapsed.

"I just felt really dizzy, really nauseous, was having heart palpitations and was really hot," she says.

There had been no prior warning. Saskia, a special educational needs teacher, was a keen goalkeeper who played football four times a week and felt fit and healthy.

She would later be diagnosed as vitamin D-deficient – blood tests showed her levels were "next to nothing".

In the UK, low vitamin rates are increasing in some age groups, external - particularly in girls and young women.

According to data from the National Diet and Nutrition Survey, last year nearly a quarter of 11- to 18-year-olds were classed as deficient.