The number of hungry people in the world has dropped by 100 million over the last 10 years but one in nine are still undernourished, with Asia home to the majority of the underfed, says UN.
The UN's food agencies said the global number was down over 200 million since the early 1990s, but warned that despite the progress made, "about 805 million people in the world, or one in nine, suffer from hunger."
But the battle to reduce hunger is being made more difficult not only by conflicts in the Middle East and Africa, but also by the Ebola crisis.
The Millennium Development Goal of halving the proportion of undernourished people by 2015 is within reach "if appropriate and immediate efforts are stepped up," the Food and Agriculture Organization, International Fund for Agricultural Development and World Food Programme said in a yearly report.
To date, 63 developing countries have reached the target and six more are on track to reach it by 2015, they said.
"This is proof that we can win the war against hunger and should inspire countries to move forward, with the assistance of the international community as needed," the agencies said in a joint message.
However, "the biggest challenge to achieving 'zero hunger' is conflicts which turn into food crises, such as in Iraq, Syria, South Sudan and Central Africa, as well as the Ebola crisis affecting Guinea, Nigeria and Sierra Leone," WFP head Ertharin Cousin told journalists at the unveiling of the report.
"The sick are not harvesting their crops and the loss of this harvest will be considerable, impacting up to 1.3 million people," she said.
- 'Time has run out' -
The "State of Food Insecurity in the World" report said access to food had improved rapidly in countries that had seen overall economic progress, notably in East and Southeast Asia, but also South Asia and Latin America.
However, despite significant progress overall, several regions and sub-regions are struggling, with more than one in four people still chronically undernourished in Sub-Saharan Africa, while Asia as a whole is home to the majority of the hungry, some 526 million people.
And while 25 countries have achieved the "more ambitious World Food Summit (WFS) target of halving the number of undernourished people by 2015", the UN said "time has run out on reaching the WFS target at the global level."
While many developing countries are still struggling to improve access to food for the poorest people, bad diets are hampering the battle against malnutrition in others, leading to serious health problems.
"Despite considerable improvements over the last two decades, stunting, underweight and micronutrient deficiencies remain stubbornly high, even where availability and access no longer pose problems," the report said.
In Sub-Saharan Africa, hit by political instability, war and civil strife, sluggish income growth, high poverty rates and poor infrastructure have hampered access to the limited food supplies, leading to a prevalence of stunted and underweight children under five.
- 'Neither pity nor charity' -
In Asia, the fight against hunger has been helped by improvements in China, Indonesia, Thailand and Vietnam in particular, thanks largely to their rapid economic growth over the past three decades.
But the Caucasus and Central Asia are still exposed to food supply swings or political instability, and on the whole Asia continues to face challenges in how food is consumed, with problematic hygiene conditions and a continuing need to improve dietary quality, the report said.
The UN said eradicating hunger "will make a major contribution to poverty reduction and to global peace and stability" and urged international leaders to invest in sustainable family farming.
"Family farmers produce a high proportion of the food we eat and are, by far, the biggest source of employment in the world. They are also the custodians of the world?s agricultural biodiversity and other natural resources," the report said.
Key measures to tackle hunger include improving links between farmers and markets, cutting down on food waste -- particularly after harvests -- and raising incomes, it said.
"Those affected by hunger need neither pity nor charity, but security in order to work and cultivate their lands," said John McIntire from IFAD's program management department.