On average, people on semaglutide 2.4mg lose 14.9% of body weight at 68 weeks (STEP 1 trial, Wilding et al. 2021, NEJM). On tirzepatide 15mg, the average is 20.9% at 72 weeks (SURMOUNT-1, Jastreboff et al. 2022, NEJM). Real-world numbers tend to come in slightly lower because adherence isn’t perfect.<\/p>\n
That’s the headline. The more useful question is what range you fall into, because GLP-1 response is highly variable. About 14% of STEP 1 patients lost less than 5%. Another 32% lost over 20%. The mean hides the spread.<\/p>\n
Your individual percentage depends on dose tolerated, starting BMI, sex, diet quality, and how long you stay on the medication.<\/p>\n
At TrimRx, we believe that understanding your options is the first step toward a more manageable health journey. You can take the free assessment quiz if you’re ready to see whether a personalized program is a fit for you.<\/p>\n
STEP 1 is the reference trial: 1,961 adults with BMI 30+ on semaglutide 2.4mg weekly for 68 weeks.<\/strong> Mean weight change was -14.9% versus -2.4% on placebo. Sixty-nine percent of patients lost 10% or more, and 32% lost 20% or more.<\/p>\n Quick Answer: Semaglutide 2.4mg: 14.9% mean body weight loss at 68 weeks (STEP 1)<\/p>\n The SUSTAIN trials in type 2 diabetes show smaller percentages, typically 4-7%, because diabetes blunts GLP-1 weight response and the doses studied were lower. SUSTAIN 7 (1mg semaglutide vs dulaglutide) showed 6.5% loss at 40 weeks.<\/p>\n Real-world cohorts published in JAMA Network Open 2024 found average 12-month loss of 8-11% for semaglutide users, lower than trials because of dose interruptions and shorter time at maximum dose.<\/p>\n SURMOUNT-1 tested 2.5, 5, 10, and 15mg tirzepatide in 2,539 adults without diabetes.<\/strong> Mean weight loss at 72 weeks: 15.0% on 5mg, 19.5% on 10mg, and 20.9% on 15mg. Placebo lost 3.1%.<\/p>\n Ninety-one percent of patients on 15mg lost 5% or more. Half (50.1%) lost at least 20%. About 36% lost 25% or more, and roughly 9% lost 30% or more.<\/p>\n SURMOUNT-2 in adults with type 2 diabetes showed smaller numbers (15.7% on 15mg at 72 weeks), confirming the diabetes-blunting pattern.<\/p>\n At currently approved maximum doses for obesity:<\/p>\n The newer molecules target more receptors. Liraglutide and semaglutide are GLP-1 only. Tirzepatide is dual GIP\/GLP-1. Retatrutide is triple GIP\/GLP-1\/glucagon. Receptor count tracks roughly with magnitude of weight loss.<\/p>\n Even at identical doses, response varies.<\/strong> STEP 1 showed about 14% of patients lost under 5%, while 7% lost over 30%. That’s a 6x spread on the same drug.<\/p>\n Drivers of response include genetics (variants in GLP1R, MC4R, and FTO genes), starting BMI (heavier patients tend to lose more in pounds but similar percentages), sex (women generally lose 2-3% more on average), and concurrent medications (antipsychotics, beta blockers, and some antidepressants blunt response).<\/p>\n Lifestyle accounts for a big chunk. A 2024 Obesity paper found that patients eating 0.8+ grams protein per pound of goal weight lost 4-6% more body weight than low-protein eaters on the same dose.<\/p>\n Loss under 5% at 6 months on max tolerated dose is generally considered non-response.<\/strong> Affects roughly 10-14% of patients on semaglutide and 8-12% on tirzepatide.<\/p>\n Reasons include genetic factors, undiagnosed thyroid disease, sleep apnea (untreated OSA blunts weight loss substantially), medications, and stress hormones. About a third of non-responders to semaglutide respond well when switched to tirzepatide, which is the most common clinical move.<\/p>\n A TrimRx personalized treatment plan typically includes a labs panel that can flag the medical causes of non-response before assuming the drug doesn’t work for you.<\/p>\n Key Takeaway: Top quartile of responders on tirzepatide lose 25-30%+<\/p>\n The STEP trials all required lifestyle counseling (calorie reduction + 150 min\/week activity).<\/strong> Real-world patients who actually do this consistently lose 3-6 percentage points more than those who don’t.<\/p>\n The SCALE trials of liraglutide showed that combining the drug with the DPP-style behavioral program produced 7.4% loss versus 4.0% on drug alone. Same pattern across the GLP-1 class.<\/p>\n Resistance training is the multiplier most people skip. Two to three sessions per week preserves lean mass, keeps resting metabolic rate higher, and lets you stay in a deficit longer. People who lift while on GLP-1 hit higher percentage milestones and keep them off better after stopping.<\/p>\n The standard threshold is 5%.<\/strong> At 5% body weight loss, blood pressure drops measurably, A1C improves, and triglycerides fall. At 10%, sleep apnea often improves and fatty liver markers start moving. At 15%+, diabetes remission becomes possible and most metabolic syndrome components resolve.<\/p>\n The SELECT trial (Lincoff et al. 2023, NEJM) found a 20% reduction in major cardiovascular events with just 9.4% mean weight loss on semaglutide in patients with existing CVD. So cardiovascular benefit kicks in earlier than peak weight loss.<\/p>\n For perspective, even 7-10% is more weight loss than any prior obesity drug consistently delivered. The GLP-1 class reset what’s possible.<\/p>\n At 6 months on tirzepatide max dose, most responders are at 10-13%.<\/strong> At 12 months, 16-19%. At 18-24 months, 20-25% for responders, with extension trials suggesting modest continued loss through month 30.<\/p>\n Semaglutide tracks 4-6 percentage points lower at each milestone. Both drugs show the curve flattening between months 14-20, which is where most patients hit a plateau.<\/p>\n A plateau doesn’t mean failure. It usually means a new setpoint, and continued therapy keeps weight there rather than letting it regain.<\/p>\n Bottom line: Real-world average is typically 2-4 percentage points lower than trial average<\/p>\n Ozempic is semaglutide 0.25-2.0mg for diabetes. At the diabetes-approved doses, patients lose 5-9% body weight. Wegovy is the same molecule at 2.4mg for obesity and produces 14.9% mean loss.<\/p>\n Women lose 2-3 percentage points more on average across STEP and SURMOUNT data. Likely related to differences in lean mass, baseline body composition, and how GLP-1 affects appetite signaling between sexes.<\/p>\n Percentage loss is roughly similar across BMI categories. Absolute pound loss is higher in heavier patients because they have more weight to lose. Someone at 300 pounds losing 20% loses 60 pounds; someone at 200 losing 20% loses 40.<\/p>\n Early response correlates with end response. STEP 1 data shows patients who lost 5% by week 16 had a 90% chance of hitting 10%+ by week 68. Slow early responders rarely become big late responders without a drug switch or dose increase.<\/p>\n It’s clinically meaningful. It’s just below the trial average for semaglutide and well below the average for tirzepatide. If you’re at 10% on max dose at 12 months and want more, switching molecules or adding behavioral support is common.<\/p>\n Yes for a portion of patients. Extension data from STEP and SURMOUNT shows continued slow loss in 25-40% of patients through years 2-3, with most others maintaining their losses on continued therapy.<\/p>\n Disclaimer:<\/strong> This content is for informational purposes only and does not constitute medical advice. It is not intended to diagnose, treat, cure, or prevent any disease or condition. Individual results may vary. Always consult a qualified healthcare professional before starting any weight loss program or medication.<\/p>\n","protected":false},"excerpt":{"rendered":" On average, people on semaglutide 2.4mg lose 14.9% of body weight at 68 weeks (STEP 1 trial, Wilding et al. 2021, NEJM).<\/p>\n","protected":false},"author":11,"featured_media":93253,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_yoast_wpseo_title":"What Percentage of Body Weight Do People Lose on GLP-1?","_yoast_wpseo_metadesc":"On average, people on semaglutide 2.4mg lose 14.9% of body weight at 68 weeks (STEP 1 trial, Wilding et al. 2021, NEJM).","_yoast_wpseo_focuskw":"percentage weight loss","footnotes":"","_flyrank_wpseo_metadesc":""},"categories":[12],"tags":[29,56],"class_list":["post-90451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-weight-loss","tag-glp-1","tag-weight-loss"],"_links":{"self":[{"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/posts\/90451","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/comments?post=90451"}],"version-history":[{"count":1,"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/posts\/90451\/revisions"}],"predecessor-version":[{"id":91777,"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/posts\/90451\/revisions\/91777"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/media\/93253"}],"wp:attachment":[{"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/media?parent=90451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/categories?post=90451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trimrx.com\/blog\/wp-json\/wp\/v2\/tags?post=90451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}What Is the Average Percentage Weight Loss on Tirzepatide?<\/h2>\n
How Does Percentage Weight Loss Compare Across GLP-1 Drugs?<\/h2>\n
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Why Do Percentage Results Vary So Much Between People?<\/h2>\n
What’s a Non-response on GLP-1?<\/h2>\n
How Does Diet and Exercise Change the Percentage?<\/h2>\n
What Percentage of Weight Loss Is “Clinically Meaningful”?<\/h2>\n
What Percentage Is Realistic at 6 Months, 1 Year, and 2 Years?<\/h2>\n
FAQ<\/h2>\n
What Percentage of Body Weight Is Lost on Ozempic\u00ae?<\/h3>\n
Do Men or Women Lose a Higher Percentage?<\/h3>\n
How Does Starting BMI Affect Percentage Weight Loss?<\/h3>\n
Can You Predict Your Percentage in the First Month?<\/h3>\n
Is 10% a Good Result on GLP-1?<\/h3>\n
Does Percentage Loss Continue Past 2 Years?<\/h3>\n