That amount is a fraction of what the world's wealthiest countries—particularly the United States—put toward military spending in a year.
In total, the WFP found that 343 million people in 74 countries are acutely food insecure—a 10% increase from last year.
"Global humanitarian needs are rising, fueled by devastating conflicts, more frequent climate disasters, and extensive economic turmoil. Yet funding is failing to keep pace," said Cindy McCain, WFP executive director.
With $16.9 billion, the WFP said it could assist 123 million people who are most vulnerable to extreme hunger.
Among those are 1.9 million people who "are on the brink of famine," including those in Gaza, where access to food has been decimated in the last 13 months by Israel's near-total humanitarian aid blockade, repeated forced displacements, and U.S.-backed bombardment of the enclave. Many people in Gaza are now eating just one meal per day, and the United Nations this week warned of a "stark increase" in the number of households facing severe hunger in the southern and central parts of the territory.
More than 90% of people in Gaza are now "acutely food insecure," with 16% living in "catastrophic conditions," according to the United Nations.
"We urgently need financial and diplomatic support from the international community: to reverse the rising tide of global needs, and help vulnerable communities build long-term resilience against food insecurity."
People in Haiti and the sub-Saharan African countries of Mali, Sudan, and South Sudan were also identified as being most at risk for extreme hunger, with the region called "ground zero" for the humanitarian crisis.
Over 170 million people in sub-Saharan Africa are "acutely" food insecure, said the WFP. The region "accounts for 50% of WFP's projected funding needs in 2025," driven by climate extremes as well as violent conflicts in Sudan, the Democratic Republic of Congo (DRC), and the Sahel region.
The U.N. Famine Review Committee in August declared that famine had taken hold in a camp where hundreds of thousands of people live in North Darfur, Sudan, after being forcibly displaced by the civil war there.
The U.N. also reported on Thursday that 25.6 million people in the DRC—or 1 in 4—now suffer from "crisis or worse" levels of hunger, driven partially by fighting between armed groups.
"In such a fragile context, the cost of inaction is truly unthinkable," said Peter Musoko, WFP country director and representative for DRC. "Together, we need to work with the government and the humanitarian community to increase resources for this neglected crisis."
Across Asia and the Pacific, WFP said the hunger crisis facing 88 million people is caused largely by "increasingly frequent climate disasters."
In Afghanistan, approximately 12.4 million people faced acute food insecurity last month, linked to the "devastation caused by heavy rainfall and flooding."
The severe impact of Typhoon Yagi in Myanmar led to "even more displacement" and food insecurity, compounding the effects of an escalating civil war, and nearly 6 million people in eastern Bangladesh were also affected by severe flooding this year.
"At WFP, we are dedicated to achieving a world without hunger," said McCain. "But to get there, we urgently need financial and diplomatic support from the international community: to reverse the rising tide of global needs, and help vulnerable communities build long-term resilience against food insecurity."