I found this PBL project on BIE.org and it is titled "Special Diets". This mathematical group project has the students research specific nutritional diets with patients of certain illnesses. The students will use systems of equations and inequalities to create a presentation for a doctor suggesting nutrition requirements of patients with illnesses. This is a great idea for PBL in a math class!

This site offers 12 great PBL resources. Many teachers need help when organizing and facilitating PBL and this site can lead them to great ideas and projects in any classroom.