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Gastrointestinal adverse events were reported in 62% of the group taking semaglutide, compared to 42% in the placebo group.[ref] Bigger picture of GLP-1 in the rise of obesity: Several recent studies shed light on how environmental factors may be causing a decrease in GLP-1 levels
Adverse Reactions/Side Effects Mild transient diarrhea, polycythemia vera, peripheral vascular thrombosis, itching transitory exanthema, feeling of swelling of entire body, anaphylactic shock and death
While there is ongoing discussion about the balance and significance of the above mechanisms, it is clear that GLP-1 receptor agonists do reliably trigger weight loss, at least while people are taking the drug