Retatrutide: The Neurocognitive Implications of Triple-Receptor Agonism: A Conceptual and Systematic Analysis of Retatrutide (LY3437943) on Executive Functions, Information Processing, and Energetic Homeostasis

Retatrutide (LY3437943) is a single-peptide agonist of glucose-dependent insulinotropic polypeptide, glucagon-like peptide-1, and glucagon receptors with substantial metabolic efficacy but an incompletely characterised psychological phenotype. This paper evaluates its plausible effects on executive control, information processing, food-directed cognitive interference, motivational salience, fatigue, and psychophysiological vigor. A structured evidence synthesis covered literature from 2010 through 10 August 2026 and separated direct retatrutide findings from receptor-level and broader cognitive-neuroscience evidence. Human studies demonstrate changes in appetite, perceived hunger, disinhibition, dietary restraint, weight-related experience, and treatment-emergent fatigue, but do not directly demonstrate improved working memory, sustained attention, processing speed, or executive functioning. Constituent receptor literature supports plausible pathways involving satiety, food valuation, reward, and energetic regulation. Accordingly, reduced food-related cognitive interference and altered incentive salience remain defensible hypotheses; generalized cognitive enhancement and anhedonia do not. The proposed model therefore locates retatrutide's most credible neuropsychological relevance in altered cognitive competition rather than increased cognitive capacity, with fatigue as a competing pathway. Dedicated longitudinal measures of cognition, reward, affect, sleep, and fatigability are required to determine whether retatrutide changes cognition itself or primarily the conditions under which cognition operates.