Obesity and type 2 diabetes frequently coexist, and both shape the risk of foot complications. Excess body weight is easy to measure, but its link to diabetic foot ulceration is more nuanced than “more weight, more ulcers.” Newer weight-loss treatments, including GLP-1 receptor agonists and bariatric surgery, have also raised a practical question: does intentional weight loss improve foot outcomes? This article reviews what the published evidence currently supports.
How Body Weight Relates to Foot Ulcer Risk
In high-income settings, the dominant predictors of ulceration are peripheral neuropathy, peripheral artery disease, and foot deformity. Body weight appears to act largely indirectly, by raising plantar pressure and promoting callus formation. A systematic review by Hulshof and colleagues (Journal of Clinical Medicine, 2020) screened 1,954 records and included 36 studies. It found low-to-moderate quality evidence that lower barefoot plantar pressure was associated with a lower risk of ulcer development and shorter healing times, and that better footwear and device adherence was associated with fewer ulcers and faster healing.
A 2026 narrative review by Brocklehurst and colleagues (Limb Preservation Journal) argues that obesity belongs at the centre of risk assessment. It summarizes Mendelian randomisation data in which genetically predicted BMI was causally associated with diabetic foot ulcer (odds ratio 1.24, 95% CI 1.09–1.42), independent of glycaemic traits. It also describes NHANES analyses in which central adiposity measures, such as the weight-adjusted waist index, were associated with prevalent foot ulceration. Reported associations from lower-income settings vary widely in size, which reflects differences in study design and population.
The “Obesity Paradox”
Some cohorts have found lower ulcer incidence among overweight individuals after adjustment. The reviewers attribute this to residual confounding and survivor bias rather than true protection. Current interpretation is that obesity is a modifiable risk factor, not a protective one.
Obesity and Wound Healing
Obesity may also affect recovery once an ulcer has formed. Studies summarized in the 2026 review reported lower rates of healing within three months among patients with obesity in a Saudi Arabian cohort (24% versus 61% with normal BMI), and larger, longer-standing ulcers in a Pakistani inpatient cohort. These are small, single-region observational studies, so they indicate a direction of association rather than a firm effect size. The same review highlights a significant gap: prospective trials of intentional weight loss in people with foot ulceration are lacking.
Weight-Loss Therapies and Foot Outcomes
GLP-1 Receptor Agonists
Schäfer and colleagues (Diabetes Research and Clinical Practice, 2023) analyzed Danish national registers covering 309,116 people with type 2 diabetes, including 7,333 amputation cases. Using time-varying Cox models and propensity score matching, they found that liraglutide treatment was associated with a lower risk of major amputation (HR 0.415, 95% CI 0.298–0.579) and minor amputation (HR 0.764, 95% CI 0.629–0.937). The authors noted that this was an observational design with possible residual confounding, and that results for other GLP-1 agents were imprecise.
For vascular function, the STRIDE trial (Bonaca and colleagues, The Lancet, 2025) randomized 792 adults with type 2 diabetes and symptomatic peripheral artery disease to once-weekly semaglutide 1.0 mg or placebo. At 52 weeks, maximum treadmill walking distance improved by about 13% relative to placebo. STRIDE measured walking capacity, not ulcer healing or amputation, so it should not be read as evidence of limb-salvage benefit.
Caution is also warranted regarding nutrition. A narrative review cited by Brocklehurst and colleagues reported that GLP-1 agents reduced caloric intake by 16–39%, which could limit the protein and micronutrients needed for tissue repair in people with active wounds.
Bariatric Surgery
Wang and colleagues (Journal of Diabetes and its Complications, 2024) systematically reviewed bariatric surgery and diabetes-related foot complications in type 2 diabetes. Observational studies showed a 51% lower risk (incidence ratio 0.49, 95% CI 0.31–0.77), and neuropathy assessment measures improved. However, the pooled randomized trials did not show a significant reduction (incidence ratio 0.87, 95% CI 0.26–2.98), and the confidence interval was wide. The authors characterized surgery as promising but with mixed evidence. A case report described new ulceration and Charcot neuroarthropathy after major weight loss and increased activity, a reminder that rapid changes in body weight and mobility alter foot loading.
Key Takeaways
Obesity contributes to diabetic foot ulceration mainly through increased plantar loading, alongside neuropathy, deformity, and arterial disease, and it is best regarded as a modifiable risk factor. Observational data link GLP-1 receptor agonists and bariatric surgery with fewer amputations or foot complications, but randomized evidence on ulcer and amputation outcomes is limited or absent. Weight loss in people with foot disease also carries nutritional and biomechanical considerations that remain under-studied.
References
- Hulshof CM, van Netten JJ, Pijnappels M, Bus SA. The role of foot-loading factors and their associations with ulcer development and ulcer healing in people with diabetes: a systematic review. Journal of Clinical Medicine. 2020;9(11).
- Schäfer Z, Mathisen A, Thomsen TR, Rossing P, Kirketerp-Møller K. Glucagon-like peptide-1 treatment reduces the risk of diabetes type 2 related amputations: a cohort study in Denmark. Diabetes Research and Clinical Practice. 2023;202:110799.
- Wang Z, Crowe FL, Tahrani AA, et al. The effect of bariatric surgery on diabetes related foot complications among patients with type 2 diabetes: a systematic review. Journal of Diabetes and its Complications. 2024;38(9):108813.
- Bonaca MP, et al. Semaglutide and walking capacity in people with symptomatic peripheral artery disease and type 2 diabetes (STRIDE). The Lancet. 2025.
- Brocklehurst J, Al-Bader J, Egan A. The association between clinical obesity and diabetes-related foot ulceration. Limb Preservation Journal. 2026;7(1):90–96.
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