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Unexplained muscle weakness or general sluggishness throughout the day
Key Insights Fatigue is a common but usually temporary side effect during the initial weeks or dose changes in GLP-1 therapy, caused largely by rapid calorie deficit, dehydration, and metabolic adjustments. Maintaining steady energy requires prioritising nutrient-dense meals rich in protein and complex carbohydrates, staying well hydrated, and managing electrolyte balance, which helps mitigate tiredness and supports overall metabolism. Gentle physical activity and good sleep hygiene are critical lifestyle adjustments that improve circulation, mood, and energy levels without overtaxing the body during the drug adaptation period. Persistent, worsening, or debilitating fatigue should prompt medical evaluation to exclude other causes, reassess medication dosing, and ensure safe continuation of GLP-1 therapy under healthcare supervision. Frequently asked questions Why do GLP-1 medications cause fatigue
Potential Liver-Related Side Effects and Risks Whilst GLP-1 receptor agonists are generally well-tolerated, healthcare professionals must remain vigilant for potential liver-related adverse effects
In addition, we discuss the increase in the endogenous secretion of this hormone through various stimuli (e.g., carbohydrates, proteins, gut microbiota, bacteria-derived molecules, bile acids, lipids, fatty acids, polyphenols, etc.) or by the increase of GLP-1-producing cells, i.e., L-cells, which can be an appropriate approach for the management of diabetes
