Research
Energy balance
Intentional pre-surgical weight loss, when achieved, is associated with improved surgical outcomes, including reduced complications and shorter hospital stays.
If you can safely lose weight before surgery, it may reduce your risk of complications and shorten your hospital stay. However, do not let the pressure to lose weight delay your surgery if you are unable to do so, as the delay itself carries risks.
GoodSupportsHIGH confidence
A similar study in Finland found those losing >10 % of total body weight prior to gastric bypass surgery was associated with shorter operative time, reduced length of hospital stay, fewer post-operative complications and greater weight loss after 12 months, compared to those who lost <5 % body weight pre-operatively
Why this rating
Supported by multiple retrospective cohort studies and meta-analyses.
Source
Addressing uncertainty about the role of structured lifestyle modification for metabolic surgery patients
Enda Murphy et al. · Metabolism · 2023
DOI 10.1016/j.metabol.2023.155739
narrative_review
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Mandatory structured lifestyle modification programs prior to metabolic surgery do not improve post-operative outcomes and may cause harm by delaying access to surgery.Good
- Pre-operative Very Low Energy Diets (VLEDs) used for 14 days may reduce technical difficulty and early complications by reducing liver volume, but do not significantly impact 30-day morbidity or operative time.Moderate
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- Bariatric surgery is superior to medical management alone for inducing significant long-term weight loss, remission of type 2 diabetes, and reduction in mortality for patients with BMI ≥ 40 or ≥ 35 with comorbidities.Strong
- Achieving type 2 diabetes remission requires significant weight loss (≥15 kg) via major caloric restriction, independent of macronutrient composition.Strong
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