"Each one percentage increase in food insecurity in a population compels 1.9 per cent more people to migrate," a new report by the World Food Programme (WFP) said.
In addition, 0.4 per cent more people flee a country for each additional year of conflict, it said.
Little or no access to food and other humanitarian assistance compel people to keep moving. And then they also often find due to the hardship of their journey that migration itself can cause food insecurity.
"By understanding the dynamics that compel people to move, we can better address what lies at the heart of forced migration and what must be done to end their suffering," he said.
The WFP report includes some accounts that give a sense of the food crisis facing migrants.
A woman who fled Syria to Jordan with her family told the UN: "We had to eat grass to survive. My kids stayed up all night crying because they were hungry."
The total number of migrants worldwide reached 244 million in 2015, and among them a record 63 million were forced to leave their homes, including refugees, displaced people within their countries and asylum seekers, the Rome- based UN agency.
The WFP study also found that armed conflict was what triggered migrants to cross borders, and to a lesser extent natural catastrophes and economic factors.
The report also said that displaced people don't want to move away and try to stay close to their place of origin.
The report recommended that the international community invest in food supplies and livelihoods as close as possible to the displaced peoples homes to reduce further displacement and further migration.
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