"Securing peaceful and inclusive societies is a necessary condition to that end", the report concludes.
Starvation struck in parts of South Sudan for several months in early 2017, and there is a high risk that it could reoccur there as well as appear in other conflict-affected places, namely northeast Nigeria, Somalia and Yemen, they reminded.
The report finds about 815 million people globally did not have enough to eat in 2016 - 38 million more than the previous year.
"Over the last decade, conflicts have greatly increased and become more complex and hard to resolve", say in the foreword of the report the heads of the United Nations Food and (FAO), the International Fund for agricultural development (IFAD), the UN Children's Fund (UNICEF), the World food Program (WFP) and the World health Organization (WHO).
This report is the first global assessment of the United Nations on food security and nutrition to appear in the extension of the Sustainable Development Program in 2030, which has made the eradication of hunger and all forms of malnutrition the main worldwide policy priority.
And it sends a clear warning signal that the ambition of a world without hunger and malnutrition by 2030 will be challenging - achieving it will require renewed efforts through new ways of working.
"We are broadening our collaboration, expanding the discussion, and understanding the linkages between hunger and malnutrition", said Marco Sánchez Cantillo, deputy director and officer in charge of the Agricultural Development Economics Division of the United Nations.
489 million hungry people, and 122 million children, live in countries affected by conflict.
"Economic slowdowns in countries highly dependent on oil and other primary commodity export revenues have also had an impact on food availability and/or reduced people's ability to access food", said the report.
"He said the agency had a lot of research that showed food insecurity "doesn't directly lead to conflict, but it is a very powerful trigger", while food security has been as seen as a contributor to maintaining peace".
Intense and prolonged droughts can significantly increase the likelihood of conflict, according to the report.
Earlier this year Unicef estimated that "more than 460,000 children in Yemen face severe malnutrition, while 3.3 million children and pregnant or lactating women suffer from acute malnutrition". It also believes that 41 million children are now overweight.
"Obesity is going to increasingly affect the poor, caused by poor diet and poor lifestyle", Mr Aguayo said.
But even in more peaceful regions, droughts or floods caused in part by El Niño and the global economic slowdown, have deteriorated food security and nutrition, note the heads of United Nations agencies.
According to The State of Food Insecurity and Nutrition in the World, global hunger numbers fell from 926 million in 2005 to 795 million in 2010.
"If we want to beat poverty, injustice and hunger we need to tackle climate change".