Jackson is appearing in online public service announcements intended to educate people about how 1.4 million children are at risk of severe malnutrition in the area.
"We are all facing a silent emergency. So many children are at risk of losing their lives in the Sahel region of Africa because they don't have food to eat," Jackson said in a statement Monday. "We must act now to save and protect children at risk from malnutrition -- not just in emergencies -- but for today and forever. I commit my heart, my love, and my resources to this effort. With your help and the leadership of UNICEF, we will bring change to West and Central Africa."