In rats, a specific fatty acid delivered directly into the intestine reduces eating not because it signals fullness, but because it damages the intestinal tissue, which also triggers an aversion to...
Mechanism
Synthesis from 1 study
Sodium oleate hurts the rat’s gut, making it feel sick. The rat learns to avoid food that it ate before feeling sick, so it stops eating. Other fats don’t hurt the gut, so they don’t make the rat feel sick or stop eating.
Most probable mechanism
When sodium oleate is put directly into the intestine, it damages the lining, which triggers nausea. The rat learns to associate the taste of food with feeling sick, so it stops eating to avoid getting sick again. Other fats that don’t damage the intestine don’t cause this reaction.
Sodium oleate causes physical damage to the intestinal mucosal lining
Intestinal damage activates visceral nociceptive pathways and induces a nausea-like state
The nausea-like state leads to conditioned taste aversion, where the animal avoids food associated with the unpleasant sensation
Non-damaging fatty acid forms do not activate these pathways and therefore do not suppress food intake
Evidence from Studies
Supporting (1)
Community contributions welcome
Satiety from fat? Adverse effects of intestinal infusion of sodium oleate.
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.