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Systemic GLP-1 receptor deficiency impairs GLP-1-induced anorexia as anticipated.41 However, these mice do not display alterations in baseline body weight, suggesting that GLP-1 receptor is not critical for body weight regulation under basal conditions.41 Notably, subsequent investigations revealed that both male and female mice lacking systemic GLP-1 receptor are resistant to diet-induced obesity.39,42 Focusing on central mechanisms, intracerebroventricular administration of GLP-1 failed to modulate feeding behavior in GLP-1 receptor global knockout mice.41 Central inhibition of GLP-1 receptor disrupts glucose homeostasis and reduces food intake, whereas peripheral GLP-1 receptor inactivation impairs glucose-stimulated insulin secretion, diminishes glucose clearance, elevates glucagon levels, and accelerates gastric emptying

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In contrast, during the withdrawal phase, GLP-1RAs appear to exert effects through broader circuits involving the lateral septum, hypothalamus, and brainstem nuclei, modulating stress responsivity, negative affect, and somatic symptoms, as evidenced in models of opioid and nicotine withdrawal

The muscle preservation evidence: what research actually shows No published clinical trial has specifically studied creatine supplementation in a semaglutide-treated population

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