Nutrient Intake One Year After Sleeve Gastrectomy vs Roux-en-Y Gastric Bypass

Overview

An exploratory substudy of a randomized trial found that energy and micronutrient intake from diet and supplements were generally similar one year after sleeve gastrectomy and Roux-en-Y gastric bypass. Despite comparable reported energy intake, Roux-en-Y gastric bypass patients experienced greater weight loss. Supplement use was nearly universal, contributing substantially to micronutrient intake.

Background

Bariatric surgery, including sleeve gastrectomy and Roux-en-Y gastric bypass, is effective for weight loss in patients with obesity. Nutritional deficiencies are a concern postoperatively due to altered gastrointestinal anatomy and intake changes. Understanding differences in nutrient intake between these procedures can guide supplementation and dietary recommendations. This substudy analyzed dietary and supplement intake at one year post-surgery in a randomized cohort with BMI 35–50 kg/m².

Data Highlights

Key Findings

• Reported daily energy intake was similar between sleeve gastrectomy (1,670 kcal) and Roux-en-Y gastric bypass (1,650 kcal) at 1 year.
• Nearly all patients (98%) used vitamin or mineral supplements, with high rates of vitamin B12, calcium with vitamin D, and multivitamin use in both groups.
• Dietary intake of several vitamins and minerals remained below recommended levels in both groups, with supplement use providing the majority of micronutrients.
• Roux-en-Y gastric bypass patients had higher dietary vitamin C intake and greater supplemental intake of vitamin A and folic acid compared to sleeve gastrectomy patients.
• Despite similar reported energy intake, Roux-en-Y gastric bypass patients achieved greater weight loss and BMI reduction in the parent trial.
• About 40% of patients were classified as acceptable reporters of dietary intake, highlighting potential underreporting limitations.

Clinical Implications

Clinicians should recognize that micronutrient intake one year after sleeve gastrectomy and Roux-en-Y gastric bypass is largely dependent on supplementation, as dietary intake alone may be insufficient. Routine monitoring and tailored supplementation remain essential to prevent deficiencies. Differences in weight loss outcomes despite similar energy intake suggest metabolic or absorption variations between procedures.

Conclusion

One year after bariatric surgery, nutrient intake from diet and supplements is generally similar and adequate following sleeve gastrectomy and Roux-en-Y gastric bypass, though supplementation is critical. Continued nutritional surveillance is warranted to address potential long-term differences.

References

1. Obesity Surgery 2024 -- Sleeve vs Gastric Bypass: Nutrient Intake at 1 Year