Eating comal scrapings sets off two distinct physiological reactions: immediate mechanical stress on the gut and systemic cellular exposure to dietary mutagens.
The immediate reaction is intensely visceral. When several tacos loaded with suadero grease residue land in the stomach, the upper digestive tract faces an overwhelming wave of oxidized lipids. The gallbladder responds by contracting violently to release bile acids into the duodenum. For diners with mild biliary dyskinesia or undiagnosed gallstones, this sudden contraction causes sharp right-upper-quadrant pain.
If the small intestine cannot emulsify this surge of dense fat, the unabsorbed lipids travel straight into the colon. The result is rapid osmotic diarrhea, often mistaken for food poisoning. In street food circles, diners blame "bad water" or contaminated cilantro. In reality, the culprit is often steatorrhea triggered by an impossible load of degraded fats that simply overwhelm human digestive capacity.
The long-term physiological concern centers on dietary carcinogens. Whenever muscle meats char over open heat, two dangerous chemical classes emerge:
- Heterocyclic Amines (HCAs): Created when amino acids, sugars, and creatine react at high temperatures.
- Polycyclic Aromatic Hydrocarbons (PAHs): Formed when meat juices and fat drop directly onto scorching heat sources, producing smoke that adheres to the food.
Toxicological research consistently links prolonged consumption of HCAs and PAHs to DNA base-pair mutations, particularly within the colon and stomach lining. Cochinada represents an unusually concentrated dietary source of these compounds. While an occasional plate will not trigger cancer on its own, eating these burnt scraps weekly creates chronic exposure to mutagenic compounds right alongside highly inflammatory lipid peroxides.
