The UN and other humanitarian agencies have said millions of North Koreans need help and have reported rising child malnutrition, while a group of US charities last autumn reported children suffering "slow starvation".
The US sent its own assessment mission to North Korea last June, but has yet to reach a decision. It has previously said that the request for food would be judged purely on the basis of need and the ability of the US to monitor its distribution because of concerns that aid could be diverted to the North Korea's powerful military.
State Department spokeswoman Victoria Nuland reiterated that stance on Monday.
She said that food aid was not linked to the nuclear issue, although it was discussed at US-North Korea negotiations on the North's nuclear program last week in Beijing.
"There is no deal to be had here," Nuland told a news briefing.
The Beijing talks were the first between the wartime enemies since the December death of North Korea's longtime leader Kim Jong Il, and were closely watched for signs of government policy under his heir and new leader, Kim Jong Un.
Before the elder Kim's death, the two sides had appeared close to reaching agreement on the US providing "nutritional assistance" to needy women, children and the elderly, and North Korea freezing its uranium enrichment.
Such a freeze could open the way for restarting six-nation aid-for-disarmament talks that North Korea withdrew from in 2009.
The US envoy on North Korea, Glyn Davies, reported "a little bit of progress" in the Beijing talks, but downplayed hopes of any immediate solution to the nuclear standoff.
Worries about North Korea's nuclear capability have taken on renewed urgency since November 2010, when it disclosed a uranium enrichment facility that could give it a second route to manufacture nuclear weapons in addition to its plutonium-based program.
- AAP