five a day?

From the Telegraph

Prisoners have been banned from buying fruit to stop them from making homebrew following a rise in assaults. Bosses at HMP Dartmoor, which houses 650 category C prisoners, decided to clamp down on fruit - including apples and pears - fruit juices, tins of fruit, Marmite and syrup to stop inmates brewing up hooch. Prisoners used Marmite, the yeast extract, to make the hooch after finding that mixing it with fruit juice and letting it ferment created a powerful drink.

To make alcohol you normally need yeast so banning Marmite should have had the desired effect rather than banning fruit. Dolts. I'm also wondering when the Dept of Health will be insisting that this decision is reversed as it goes against their change4life message?