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Weight Loss & Obesity Statistics

A data-driven reference on obesity prevalence, clinical trial outcomes for GLP-1 receptor agonists, and the public health landscape of weight management in the United States. All statistics sourced from peer-reviewed publications and government data.

Statistics are for educational reference only. Individual outcomes vary. Provider approval required for treatment.

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Key Statistics at a Glance

The following figures are drawn from government data, peer-reviewed journals, and major clinical trial programs. Group averages from clinical trials do not predict individual outcomes.

42%

of American adults have obesity (BMI ≥30)

CDC, National Center for Health Statistics, 2024

71%

of American adults are overweight or obese

CDC NHANES Data

~15%

mean body weight reduction in STEP 1 semaglutide trial (group average)

Wilding et al., NEJM 2021

~22%

mean body weight reduction in SURMOUNT-1 tirzepatide trial (highest dose, group average)

Jastreboff et al., NEJM 2022

$173B

estimated annual cost of obesity-related healthcare in the US

CDC, 2019 estimate

80%+

of participants achieved ≥5% weight loss with GLP-1 treatment in major trials

STEP & SURMOUNT trial programs

5–10%

weight loss threshold considered clinically meaningful by medical guidelines

American Society for Metabolic and Bariatric Surgery

66%

weight regain observed within 1 year of stopping GLP-1 treatment (STEP 4 data)

Davies et al., The Lancet 2021

All statistics represent population-level or group-average data from cited sources. They do not predict, imply, or guarantee any individual outcome. Treatment results vary significantly by person.

Obesity Prevalence in the United States

Obesity is now classified as a chronic disease by the American Medical Association, the World Health Organization, and major medical bodies. The prevalence has more than tripled since the 1980s, driven by complex interplays of environment, genetics, and metabolic biology.

Adults with overweight (BMI 25–29.9)

CDC NHANES, most recent cycle

30%

Adults with obesity (BMI 30–39.9)

CDC NHANES, most recent cycle

32%

Adults with severe obesity (BMI ≥40)

CDC NHANES, most recent cycle

10%

Children aged 2–19 with obesity

CDC, 2024

19.7%

Adults who have ever tried to lose weight

National surveys, CDC

~50%

GLP-1 Clinical Trial Outcome Data

The following summarizes weight loss outcome data from major randomized controlled trials. All figures represent group averages and include placebo comparisons where available. These numbers represent what trial participants experienced on average — not what any individual will experience.

TrialMedicationDurationMean Weight Loss (Treatment)Mean Weight Loss (Placebo)
STEP 1Semaglutide 2.4mg68 weeks~15%~2.4%
STEP 2Semaglutide 2.4mg (T2D)68 weeks~10%~3%
STEP 3Semaglutide + intensive behavioral68 weeks~16%~5.7%
STEP 4Semaglutide (continuation)48 weeks ext.Maintained~+7% regain
SURMOUNT-1Tirzepatide 15mg72 weeks~22%~2%
SURMOUNT-2Tirzepatide (T2D)72 weeks~15%~3%

All data from published peer-reviewed trials. Group averages do not predict individual results. Results vary significantly. Sources: NEJM, The Lancet.

Why These Statistics Matter for Patients

Understanding the clinical data landscape helps patients make informed decisions in conversation with their providers. There are several key takeaways from the data that are relevant to anyone considering medical weight loss:

Weight loss is biologically complex

Obesity research has increasingly established that weight is regulated by a complex hormonal system. This is why willpower-based approaches alone often show limited long-term success in clinical studies.

Results vary significantly

Clinical trials report group averages. Some participants lose much more, others much less. No trial result should be interpreted as a personal prediction.

Treatment continuation matters

STEP 4 data showed significant weight regain after stopping treatment, suggesting that ongoing care and provider monitoring are important components of sustained outcomes.

Provider oversight is essential

All major trials included medical oversight, dose titration, and monitoring. This is why EdenRx's provider-reviewed model is central to how we operate — not a marketing claim.

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