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How Weight Loss Medications Actually Work in Your Body

Mindfully Integrative Show

Mindfully Integrative Show
How Weight Loss Medications Actually Work in Your Body
Feb 20, 2026
Dr. Damaris Grossmann FNP-C

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We break down the mechanism of action for GLP-1 receptor agonists like tirzepatide (Zepbound/Mounjaro) and semaglutide, explaining how these medications work in the body to regulate appetite and metabolism.

• GLP-1 medications contain a C20 fatty diacid that binds to albumin, prolonging half-life
• These drugs target both GIP and GLP-1 receptors to regulate appetite and caloric intake
• Receptors are found in brain areas involved in appetite regulation and throughout the GI system
• Pharmacodynamics include increased insulin sensitivity, reduced glucagon secretion, and delayed gastric emptying
• Medications are absorbed subcutaneously with about 80% bioavailability 
• Distribution occurs throughout the body with 5-6 day half-life, explaining weekly dosing
• Metabolism occurs primarily through the liver with excretion via urine
• Common injection sites include arms, legs, stomach, or back (the "margarita" zones)

Never do this on your own without real supervision. Everything has to be done safely, with a healthcare provider and someone that is aware of where you stand and how you are.


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