One anastomosis (mini) gastric bypass surgery
If you’re exploring your options for long-term weight loss, the one anastomosis gastric bypass (OAGB), also known as the mini gastric bypass, may be the right choice for you.
This modern and highly effective procedure combines the benefits of both gastric bypass and sleeve gastrectomy. It’s a simpler, single-anastomosis version of the Roux-en-Y bypass and has shown excellent results for weight loss and improvement in obesity-related conditions.
The one anastomosis gastric bypass (mini bypass) involves two key changes to your digestive system:
- Creating a smaller, narrow pouch from the stomach (similar to the shape of a sleeve gastrectomy).
- Bypassing a section of the small intestine, so food travels directly from the pouch into the intestine further down.
This means:
- You feel full with smaller portions.
- Your body absorbs fewer calories and nutrients.
- Hormonal changes support weight loss and reduce hunger.
It’s performed laparoscopically (keyhole surgery), which usually means a faster recovery and less scarring.

Benefits of the one anastomosis (mini) gastric bypass
Patients choose OAGB for many reasons, including:
- Significant and sustained weight loss
- High resolution of type 2 diabetes and other metabolic conditions
- Shorter operating time than traditional gastric bypass
- Simpler surgical technique (one join instead of two)
- Lower risk of internal hernias compared to Roux-en-Y
Surgery is just the beginning. A better lifestyle is what follows.