The weight loss produced by GLP-1 medications is genuine and clinically significant trials of semaglutide (Wegovy) have shown average weight loss of 15 to 20% of body weight over 68 weeks, which is comparable to the outcomes of bariatric surgery for many patients
In May 2024, KFF similarly reported ~12% had ever used one
Exendin-4, the GLP-1 analogue, is better studied, with an estimated half-life of 18-41 minutes for IV administration in rat models (see reference 6)
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Additionally, the study reported lower all-cause mortality among GLP-1 users, which, while encouraging, complicates interpretation of the dementia findings patients who live longer may simply have more time to develop cognitive symptoms
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