England's chief medical officer, Professor Dame Sally Davies, has said that there are five more child deaths in the UK every day than in Sweden.
She said that 40 percent of children in the UK have lower levels of vitamin D than they should have, partly as a result of not having enough exposure to sunlight.
Daybreak's Matt Barbet asked her whether free vitamins are enough:
More top news
The families of all four of the victims, all of whom were men, have been informed, police said.
A motorcyclist from Nottingham has died in an accident at the Macau Grand Prix in China, earlier today.
AC/DC co-founder and ex-guitarist Malcolm Young has died aged 64, his publicist has announced.