Sounds like you have a GI problem associated with greasy food. Yellow stool is too much fat. Maybe you should stop pounding the convince store food before pointing fingers. Maybe they did change an ingredient in the grease but if it's anything they don't fry everything.
Food Safety Report: KWIK TRIP #140, Schofield Avenue, Weston, WI, USA
Sounds like you have a GI problem associated with greasy food. Yellow stool is too much fat. Maybe you should stop pounding the convince store food before pointing fingers. Maybe they did change an ingredient in the grease but if it's anything they don't fry everything.