Families in West Kordofan are eating Ambaz, a peanut byproduct normally fed to livestock, as famine looms.
The Kordofan Observatory reported the shift on Wednesday, citing collapsing incomes and soaring food prices across the region.
A sack of millet now costs 35,000 Sudanese pounds, pushing it beyond the reach of many households.
Demand for Ambaz has since surged, driving its price to roughly 10,000 pounds per malwa.
The observatory blamed fighting near Al-Abyad and rival military buildups for disrupting trade routes and aid delivery.
Delayed rains have further hampered farmers already struggling to reach their land amid the violence.
The group urged warring parties to secure roads and humanitarian corridors, warning against using food as a weapon.
It also called on Khartoum authorities to lift restrictions on goods entering RSF-held areas, and urged international bodies to prioritize urgent aid.
