Post hoc analysis of four SURMOUNT trials found tirzepatide did not worsen nutritional status in people with obesity, despite reduced appetite and food intake.
4,726 participantsAcross four phase 3 trials, no worsening of nutritional status observed
What the researchers found
Tirzepatide treatment across the SURMOUNT-1-4 trials was not associated with worsening nutritional status despite appetite and dietary intake reduction.
Why it matters
A major concern with potent appetite suppressants is that patients may not get adequate nutrition. This data is reassuring for the millions using or considering tirzepatide.
How the study worked
Post hoc descriptive analysis of nutritional data from four randomized, placebo-controlled, phase 3 trials (SURMOUNT-1 through SURMOUNT-4).
What this study cannot tell us
Post hoc analysis — not designed primarily to assess nutritional outcomes; descriptive statistics limit causal conclusions; trial populations may not represent all real-world users.
How to read the evidence
Post hoc analysis of RCT data — leverages strong trial infrastructure but was not pre-specified, limiting the strength of conclusions.
When this study was published
Published 2026. Analyzes data from the landmark SURMOUNT trial program.
The bigger picture
As obesity medications that dramatically reduce appetite become widespread, monitoring nutritional adequacy is essential to ensure weight loss does not come at the cost of malnutrition.
Questions still open
- Should nutritional monitoring be standard practice for patients on long-term tirzepatide?
- Do specific subgroups (elderly, post-bariatric surgery) face higher nutritional risk?
Common questions
Can tirzepatide cause you to become malnourished?
Should I take vitamins while on tirzepatide?
Read the original research
Nutritional status with tirzepatide in obesity: A post hoc analysis of the SURMOUNT-1-4 randomized clinical trials.
Obesity pillars, 17, 100248
Citation
Almandoz, Jaime P; Pickett-Blakely, Octavia; Tewksbury, Colleen; Stefanski, Adam; Gonsahn-Bollie, Sylvia; Dimitriadis, Georgios K; Murro, Ada Leticia; Cao, Dachuang; Meng, Qier; Neff, Lisa M. (2026). Nutritional status with tirzepatide in obesity: A post hoc analysis of the SURMOUNT-1-4 randomized clinical trials.. Obesity pillars, 17, 100248. https://doi.org/10.1016/j.obpill.2026.100248