Wound healing is an energy-expensive biological process. Building granulation tissue, synthesizing collagen, mounting an immune response against bacteria, and re-epithelializing a wound bed all draw on protein, calories, and a range of micronutrients. In diabetic foot ulceration, that metabolic demand collides with a population in which nutritional deficiency is common but rarely measured. Offloading, debridement, infection control, and revascularization dominate the clinical conversation — nutritional status is often the variable nobody checks.
Malnutrition Is Common in Diabetic Foot Ulceration — and Frequently Hidden
A review by Lauwers and colleagues in Acta Clinica Belgica examined studies that defined malnutrition using anthropometry or validated screening tools in patients with diabetic foot ulcers. Across the included studies, 49% to 70% of patients were at risk of malnutrition and 15% to 62% were frankly malnourished. Nutritional status was related to ulcer severity in one study, and three of the included papers found a negative association between malnutrition and ulcer outcome. Notably, two studies that reassessed patients at six months found no decline in malnutrition rates, suggesting the problem was not being addressed during treatment.
The deficiency pattern is not what intuition suggests. A retrospective cohort from a large Australian tertiary referral centre reported by Brookes and colleagues measured biochemical nutritional markers in 48 patients with diabetic foot ulcers. Vitamin C deficiency was present in 58.7%, with 30.4% severely deficient; 61.5% had hypoalbuminemia; and 57.9% had low vitamin D. Basic caloric screening scores failed to identify this biochemical depletion. Among patients who underwent amputation — 52.1% of the cohort — vitamin C, albumin, and hemoglobin levels were significantly lower than in those managed conservatively. Micronutrient depletion can coexist with adequate or excess caloric intake, which means body mass index and routine screening questionnaires are poor proxies for the deficiencies that matter to a wound.
Overweight Does Not Exclude Undernutrition
Cereda and colleagues, writing in Current Opinion in Clinical Nutrition and Metabolic Care, make the same point for chronic wounds in older adults generally: nutritional derangements can be present despite overweight or obesity, and screening should extend beyond pressure ulcers to venous leg ulcers and diabetic foot ulcers. Their recommended approach is individualized — address protein requirements, hydration, comorbidities, and the specific nutrients with established roles in repair, including arginine, zinc, and antioxidants.
What Supplementation Trials Actually Show
The interventional evidence is more modest than the observational signal. A 2024 systematic review in Nutrition by Espírito Santo and colleagues examined nine studies of oral nutritional supplementation in 741 patients with chronic wounds, of which 40% were diabetic foot ulcers. Four studies reported reduced wound area and increased healing rates with a hypercaloric, hyperproteic formula enriched with zinc and vitamins A, C, and E; two found no significant difference against control. Two studies of an arginine, glutamine, and β-hydroxy-β-methylbutyrate combination did not reach significance, and one favoured a high-protein formula without arginine. The authors concluded that a desirable formula is high in calories and protein and includes antioxidant micronutrients — while acknowledging the inconsistency across trials.
Vitamin D has the most specific diabetic foot literature. A meta-analysis by Wu and colleagues pooled seven randomized controlled trials involving 580 patients and found higher wound healing efficiency (RR 1.42, 95% CI 1.03–1.95) and greater wound area reduction with supplementation, alongside improvements in HbA1c (mean difference −0.44%) and inflammatory markers including hs-CRP and ESR. A separate randomized, double-blinded Danish trial by Halschou-Jensen and colleagues compared high-dose (170 μg daily) with low-dose (20 μg daily) cholecalciferol in patients with ulcers of more than six weeks’ duration: 70% of ulcers healed in the high-dose group versus 35% in the low-dose group over 48 weeks. Sample sizes remain small and the mechanism may be partly indirect, operating through glycemic control and inflammation rather than local tissue repair.
Nutrition in the Surgical and Infected Foot
Uçkay and colleagues reviewed 1,013 diabetic foot infection episodes in 586 patients at a Swiss university hospital. Episodes in which a professional nutritionist assessed and intervened were associated with shorter hospital stays, shorter antibiotic courses, and fewer surgical debridements, and a low Nutritional Risk Score was associated with significantly lower failure rates after treatment (hazard ratio 0.2, 95% CI 0.1–0.7). This was a retrospective case-control design and cannot establish causation, but it locates nutritional assessment within the same multidisciplinary pathway as infection management and surgery.
Clinical Summary
Malnutrition and micronutrient deficiency are highly prevalent in people with diabetic foot ulcers, are poorly captured by weight-based or caloric screening, and are associated with more severe ulceration and higher amputation rates. Supplementation evidence is promising but uneven: hypercaloric, high-protein formulas with antioxidant micronutrients and vitamin D repletion in deficient patients have the strongest support, while amino acid combinations remain unproven in this population. Formal nutritional screening using validated tools, and biochemical assessment where deficiency is suspected, identifies a modifiable factor that standard wound care otherwise leaves untouched.
References
- Lauwers P, Dirinck E, Van Bouwel S, et al. Malnutrition and its relation with diabetic foot ulcer severity and outcome: a review. Acta Clinica Belgica. 2022;77(1):79–85. doi:10.1080/17843286.2020.1800315
- Brookes JDL, Jaya JS, Tran H, et al. Broad-Ranging Nutritional Deficiencies Predict Amputation in Diabetic Foot Ulcers. The International Journal of Lower Extremity Wounds. 2020;19(1):27–33. doi:10.1177/1534734619876779
- Espírito Santo ACS do, Sugizaki CSA, de Morais Junior AC, et al. Impact of oral nutritional supplement composition on healing of different chronic wounds: A systematic review. Nutrition. 2024;124:112449. doi:10.1016/j.nut.2024.112449
- Wu X, Zeng J, Ye X, et al. Effects of vitamin D supplementation on diabetic foot ulcer healing: a meta-analysis. Postgraduate Medical Journal. 2025;101(1192):100–107. doi:10.1093/postmj/qgae107
- Halschou-Jensen PM, Sauer J, Bouchelouche P, et al. Improved Healing of Diabetic Foot Ulcers After High-dose Vitamin D: A Randomized Double-blinded Clinical Trial. The International Journal of Lower Extremity Wounds. 2023;22(3):466–474. doi:10.1177/15347346211020268
- Uçkay I, Yogarasa V, Waibel FWA, et al. Nutritional Interventions May Improve Outcomes of Patients Operated on for Diabetic Foot Infections: A Single-Center Case-Control Study. Journal of Diabetes Research. 2022;2022:9546144. doi:10.1155/2022/9546144
- Cereda E, Veronese N, Caccialanza R. Nutritional therapy in chronic wound management for older adults. Current Opinion in Clinical Nutrition and Metabolic Care. 2024;27(1):3–8. doi:10.1097/MCO.0000000000000990
- Grada A, Phillips TJ. Nutrition and cutaneous wound healing. Clinics in Dermatology. 2022;40(2):103–113. doi:10.1016/j.clindermatol.2021.10.002
Citations sourced via PubMed.
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