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Gastric Sleeve v Gastric Bypass

Gastric Sleeve

Gastric Bypass

Relatively new procedure
long-term results not yet available 
Regarded as the "Gold standard" procedure with decades of results and experience
Works by restriction and changes in appetite hormones such as ghrelin, resulting in marked loss of appetite
Works by restriction and changes in appetite hormones, especially ghrelin and GLP-1, resulting in marked loss of appetite

Gastric Bypass is NOT a true malabsorptive procedure

Weight loss 50-70% of excess weight*. Slightly less predictable than with gastric bypass
Weight loss consistently 70-75% of excess weight*
Technically straight forward, no cutting or joining of bowel required. Around 80% of stomach removed.
Usually takes around 45-60mins 
More technically demanding and involves dividing both the stomach and bowel. Unlike sleeve, there is no tissue removed.
Usually takes around 60-90 minutes 
Dumping syndrome is less common 
Dumping syndrome is common 
Long term vitamin and mineral deficiencies may occur, though not as marked as with gastric bypass 
Vitamin and mineral deficiencies are common
and daily supplementation is required for life
Operative mortality around 0.1-0.5% 
Operative mortality around 0.3%
Early complications, mainly bleeding and leakage in 3-5%.

Usually involves 2 night hospital stay
Early complications due to bleeding and leakage around 3-5%

Usually involves 2 night hospital stay

The most important difference lies in the fact that, compared with Gastric Bypass, the Gastric Sleeve is a relatively new procedure and there are important questions about the long-term viability of the weight loss associated with it. More research is required before a Gastric Sleeve can be considered as effective and safe in the long term as standard Gastric Bypass.  Nevertheless, it does look promising and is likely to be more widely used in the future.

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*Weight loss surgery results and benefits vary and are different for each individual. As such, Healthier Weight cannot guarantee specific weight loss goals.