Who's affected?
Rickets was common in the past, but it mostly disappeared in the western world during the early 20th century after foods like margarine and cereal were fortified with vitamin D.
However, in recent years, there's been an increase in cases of rickets in the UK. The number of rickets cases is still relatively small, but studies have shown a significant number of people in the UK have low levels of vitamin D in their blood.
Any child who doesn't get enough vitamin D or calcium either through their diet, or from sunlight, can develop rickets. But the condition is more common in children with dark skin, as this means they need more sunlight to get enough vitamin D, as well as children born prematurely or taking medication that interferes with vitamin D.