Nope, this is not a punchline. It’s an actual study that they are conducting in the UK.

The university will lead the £1.4m study in which 1,000 males aged 16 to 21 from three young offenders’ institutions in England and Scotland will be randomly allocated either the vitamin-and-mineral supplements or a placebo, and followed over 12 months.

In a pilot study of 231 prisoners by the same researchers, published in 2002, violent incidents while in custody were cut by a more than a third among those given the supplements. Overall, offences recorded by the prison authorities fell by a quarter.

It certainly would explain the relatively high crime in the US.

We have effectively been giving borderline nutrition to the poor, and it shows up in crime statistics, just like Nixon’s removal of lead paint from the market correlates to the crime drop of the 1990s.