Why some fats make rats stop eating (it's not because they're full)
Satiety from fat? Adverse effects of intestinal infusion of sodium oleate.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Scientists gave rats different forms of fat through their intestines and saw that only one kind—sodium oleate—made them sick and stop eating, not because they felt full, but because it hurt their gut.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
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Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Scientists gave rats different forms of fat through their intestines and saw that only one kind—sodium oleate—made them sick and stop eating, not because they felt full, but because it hurt their gut.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 58 / 44
Evidence Score
A snapshot of a population at a single point in time. Can identify correlations and prevalence, but cannot determine the direction of cause and effect.
Publication
Authors
Ramirez I, Tordoff MG, Friedman MI
Related Content
Claims (5)
Sodium oleate damages the intestines because of its surface-active chemical properties, not because of how the body breaks it down. Oleic acid, which the body processes the same way, does not cause damage, and when sodium oleate is chemically neutralized, it also stops causing damage.
When rats consume sodium oleate, they learn to avoid the taste of it, suggesting the compound causes a physiological discomfort similar to illness, not just fullness. Free oleic acid does not produce this effect.
When sodium oleate is introduced directly into the intestines of rats, it causes measurable damage to the intestinal lining, shown by higher levels of lactate dehydrogenase and leakage of Evans blue dye, indicating a breakdown in the barrier function of the intestinal epithelium.
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 associated tastes.
When triglyceride emulsions like Intralipid are delivered directly into the intestine, they may cause minor damage to the intestinal lining, which is detected by a delayed release of LDH during washing. This damage might lead to reduced food intake, but only because the delivery method is not natural to the body.