David Beasley visited North Korea from 8-11 May. The visit included trips to WFP-funded projects - a children's nursery in South Hwanghae province and a fortified biscuit factory in North Pyongyan province.
He told the BBC's Radio 4 programme Today that the farming he saw in the countryside reflected the fact that only about a fifth of the land is arable.
He said: "One of the most powerful things that I saw was out in the countryside - it's spring, they're planting - there's not mechanisation, you've got oxen pulling ploughs, men and women in the fields.
"It's very structured, very organised, every foot and inch of dirt is being toiled with rakes and hoes and shovels and they're literally planting crops up to the edge of the road, down embankments, using every available space, because it is a land that's mostly mountainous.
"I didn't see starvation like you had in the famine back in the 1990s, that's the good news. But is there a hunger issue, is there under-nutrition? There's no question about it."