Research

Hormonal

GLP-1 receptor agonists exhibit significant inter-individual variability in weight loss, with early responders (>=4% loss at week 16) predicting superior long-term outcomes.

If you start a GLP-1 agonist (like Ozempic or Wegovy) and don't lose at least 4% of your body weight by week 16, you are statistically likely to be a 'non-responder' with only ~3% total loss. However, early weight loss is a strong predictor of success. If you are not losing weight early, discuss with your doctor whether to continue for metabolic benefits or switch therapies, as stopping rules are often built into prescriptions.

GoodQualifiesHIGH confidence
Early weight loss in treatment has been identified as a key predictor of success with the variable response to GLP-1 RA apparent as early as 4 weeks in some trials. In the weight management programme scale less than or equal to 4% weight loss (responder) at week 16... was a strong predictor of clinically meaningful weight loss after 1 year.
Emily Brown et al. · Obesity Reviews · 2019

Why this rating

Based on multiple clinical trials and meta-analyses cited in the review.

Source

Weight loss variability with SGLT2 inhibitors and GLP‐1 receptor agonists in type 2 diabetes mellitus and obesity: Mechanistic possibilities

Emily Brown et al. · Obesity Reviews · 2019

DOI 10.1111/obr.12841

narrative_reviewCited 215×
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DOI resolved against Crossref · corpus check 2026-06-10

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