How fast will I lose weight on a GLP-1?

The trial curves all share one shape: a gentle start (titration doses are intentionally weak), a steep middle (months 2–9), and a long flattening into plateau (months 12–18). Mapped to real life: - Month 1: ≈2–4 lbs typical. Anyone promising 15 lbs in month one is describing water weight or fiction. - Months 2–6: the working phase — commonly 4–8 lbs/month as doses reach therapeutic range. - Months 6–12: continued but slowing loss. - Months 12–18: arrival at the new plateau — which is not failure but the destination. Why you shouldn’t chase speed. Sustained loss faster than ≈1% of body weight per week (after the early weeks) is associated with three predictable costs: disproportionate muscle loss, gallstones (rapid weight loss is itself a major gallstone risk factor), and hair shedding (telogen effluvium). If you’re dropping 4+ lbs/week mid-therapy and skipping meals entirely, that’s a conversation with your prescriber about holding the dose — not a victory lap. A better metric than the scale’s speed: waist measurement, strength in basic lifts, and energy. The scale wobbles with water and digestion; a shrinking waist with stable strength is the signature of fat-weighted loss at a sustainable pace.