GDF15 Induces an Aversive Visceral Malaise State that Drives Anorexia and Weight Loss.
Level 5 - mechanism / opinion, no new human data
Preclinical animal (rat) study
PubMed 32320650 · doi:10.1016/j.celrep.2020.107543
What was done
Rats were administered acute and chronic systemic doses of growth differentiation factor-15 (GDF15) or long-acting Fc-GDF15. Researchers evaluated markers of visceral malaise (pica), conditioned affective food responses (taste reactivity), gastric emptying, food intake, and body weight to determine whether GDF15-mediated anorexia and weight loss are driven by visceral malaise and conditioned aversion.
What was found
The abstract reports no numerical values, effect sizes, or confidence intervals. Directionally, pica (a behavioral marker of visceral malaise in rodents) was present across all anorectic GDF15 doses and did not decline over time, indicating a lack of tolerance. A single pairing of GDF15 with novel food induced a disgust and aversive response that persisted beyond the acute phase of GDF15 exposure. Delayed gastric emptying was found not to be required for GDF15-induced anorexia.
Why it matters
These findings suggest that GDF15-mediated appetite suppression and weight loss in rodents operate primarily through nausea-like visceral malaise and learned food aversion rather than homeostatic satiety, highlighting potential tolerability hurdles for GDF15-based obesity pharmacotherapies.
Limits
The study was conducted entirely in rats without human data, and sample sizes, specific dosages, and exact quantitative measures were not reported in the abstract. Behavioral markers like pica and taste reactivity are indirect proxies for human malaise and nausea.
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