The claim that triacylglycerols must be broken down before being absorbed is a foundational fact of gastrointestinal physiology and biochemistry, making it common knowledge that requires no citation.
The physiological digestion of dietary fats (triacylglycerols/triglycerides) into monoacylglycerols and free fatty acids by lipases prior to intestinal absorption is a textbook fact of basic biology and biochemistry. Therefore, Step 0 classifies this as common knowledge, meaning no papers should be attached and the verdict is COMMON_KNOWLEDGE.