Abstract
Background
Due to its reliable effects on type 2 diabetes mellitus (T2DM) remission, Roux-en-Y gastric bypass (RYGB) has recently been investigated as a treatment option for nonseverely obese patients with T2DM (body mass index (BMI) <35 kg/m2). The purpose of this study was to investigate whether RGYB induces malnutrition of macro- and micronutrients within 24 months in these patients.
Methods
A prospective cohort of 20 patients with longstanding, insulin-dependent T2DM and a BMI of 25–35 kg/m2 were treated with RYGB. The patients were supplemented with over-the-counter, multivitamin, and micronutrient supplements. Serum concentrations of albumin, vitamins, and trace elements, hemoglobin, and bone density were measured preoperatively and over a 24-month period (DRKS00004605).
Results
RYGB did not result in underweight or protein malnutrition. No new onset of deficiencies of water- or fat-soluble vitamins developed over the study period. However, serum selenium, zinc, and ferritin decreased significantly (selenium, 1.17 ± 0.13 to 0.89 ± 0.11 μmol/l, p = 0.018; zinc, 13.9 ± 0.5 to 10.8 ± 0.5 μmol/l, p = 0.012; ferritin, 171.7 ± 26.9 to 31.8 ± 11.2 μg/l, p = 0.018). Hemoglobin remained stable. Vitamin D (13.7 ± 1.8 to 19.1 ± 1.1 ng/ml, p = 0.017) and osteocalcin (15.3 ± 1.7 to 25.4 ± 2.7 ng/ml, p = 0.025) rose significantly, whereas the parathyroid hormone remained stable. Despite increased bone formation, bone density decreased (T score hip, 0.15 ± 0.25 to −0.71 ± 0.34, p = 0.005) resulting in a significant increase in osteopenia rates (18 to 50 %, p = 0.046).
Conclusions
This is the first prospective cohort to investigate malnutrition after RYGB in nonseverely obese patients. These patients are at risk of developing iron, selenium, and zinc deficiencies within 24 months, as well as osteopenia despite an increase in bone formation.
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Acknowledgments
There was no financial support for this study. We would like to thank Elizabeth Corrao for editing this manuscript for appropriate English.
Conflict of Interest
The authors declare that they have no conflict of interest. This study was supported by the German Research Society (DFG) awarded to Prof. P. Nawroth (SFB 1118).
Ethical Approval
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed Consent
Informed consent was obtained from all individual participants included in the study.
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Adrian T. Billeter and Pascal Probst contributed equally to this work.
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Billeter, A.T., Probst, P., Fischer, L. et al. Risk of Malnutrition, Trace Metal, and Vitamin Deficiency Post Roux-en-Y Gastric Bypass—a Prospective Study of 20 Patients with BMI <35 kg/m2 . OBES SURG 25, 2125–2134 (2015). https://doi.org/10.1007/s11695-015-1676-9
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DOI: https://doi.org/10.1007/s11695-015-1676-9