Energy balance
Preoperative weight loss via low-calorie or very low-calorie diets reduces postoperative complications and surgical complexity in bariatric surgery patients.
If you are scheduled for bariatric surgery, follow your surgeon's preoperative diet instructions strictly. This typically involves eating 800-1200 calories a day for 2-4 weeks before the operation. This is not just about weight loss; it shrinks your liver, making the surgery safer and reducing the risk of complications.
A preoperative low-calorie diet (LCD, 1000–1200 kcal/d) or very low-calorie diet (VLCD approx. 800 kcal/d) for 2-4 weeks is usually recommended in bariatric centres. This has been shown to reduce liver volume by 16–20 % and the surgeon’s perceived complexity of the procedure... preoperative weight loss was associated with reduction in postoperative complications (18.8 ± 10.6 vs. 21.4 ± 13.1 %, p = 0.02)
Why this rating
Based on systematic reviews, multicentre RCTs, and large registry studies (Scandinavian Obesity Registry), though some evidence is from non-randomized studies.
Source
Guidelines for Perioperative Care in Bariatric Surgery: Enhanced Recovery After Surgery (ERAS) Society Recommendations
Anders Thorell et al. · World Journal of Surgery · 2016
DOI 10.1007/s00268-016-3492-3
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- Laparoscopic bariatric surgery results in significantly shorter hospital stays and reduced incisional hernia rates compared to open surgery.Good
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Related findings · Energy balance
- Achieving a total body weight loss of 10-15% (or >10-15 kg) through Total Diet Replacement (TDR) induces remission of Type 2 Diabetes in individuals with short-duration disease.Strong
- 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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