Mixed
Restrictive hypocaloric diets and bariatric surgery reduce total gut microbial abundance and decrease butyrate-producing bacteria (Firmicutes, Lactobacillus, Bifidobacterium), which may have long-term detrimental effects on the colon despite promoting weight loss.
While restrictive diets and bariatric surgery are effective for weight loss, they can negatively impact your gut microbiome by reducing beneficial bacteria that produce butyrate. To mitigate this, consider incorporating prebiotics or specific probiotics, which the review notes may restore a healthy microbiome and reduce body fat, rather than relying solely on caloric restriction or surgery for gut health.
These results show that restrictive diets and bariatric surgery reduce microbial abundance and promote changes in microbial composition that could have long-term detrimental effects on the colon.
Why this rating
Based on a systematic review of 43 studies, including RCTs, though heterogeneity in methods is noted.
Source
Weight‐loss interventions and gut microbiota changes in overweight and obese patients: a systematic review
Fernanda Braga Seganfredo et al. · Obesity Reviews · 2017
DOI 10.1111/obr.12541
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
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