Reading Time: 2 minutes

What is a One Anastamosis (Mini) Bypass?

Before starting your weight loss journey, it’s helpful to understand the range of procedures available to you and what’s involved. At Healthier Weight, during your free consultation, our expert surgeons will discuss the range of surgical options we offer and help you determined the best fit for your circumstances. So, let’s talk about it, starting with the Gastric Bypass.

What is a bypass?

The goal of a gastric bypass is to reduce the size of your stomach, which restricts how much you can eat. A gastric bypass also affects your appetite and hunger levels. The procedure effectively reduces the size of your stomach, with your new smaller stomach connected directly to your small intestine through a tunnel constructed by your surgeon, thus ‘bypassing’ the rest of your stomach. The most common type of bypass procedure is the Roux-en-y gastric bypass.

The One Anastamosis Bypass (OAGB) or ‘mini’ bypass has become popular more recently as an alternative option to the Roux-en-Y. This procedure works in the same way and offers the same benefits, but involves less re-routing of the bowel. This in turn means the procedure takes less time and can reduce the risk of complications. Whilst it can often be referred to as a mini bypass, it’s worth noting that the procedure is no less significant an operation and the results are excellent for the majority of patients. As we like to say, it’s mini by name, not by nature. 

How does it work?

An OAGB is performed through what is called a ‘keyhole surgery’. This essentially means the surgery is minimally invasive as it doesn’t involve any large incisions. There are a total of 3-5 incisions, through which your surgeon will then staple the stomach into 2 parts and position the smaller portion of the stomach to the small intestines, all within the space of 40-60 minutes.

The difference between a mini (OAGB) bypass and a full (Roux en y) gastric bypass?

The key difference between a full gastric bypass and an OAGB is in the number of joins between the stomach and bowel. A Roux-en-y gastric bypass has two of these ‘joins’ – upper and lower. An OAGB bypass has only one join and involves less rerouting of the intestine, lowering the risk of complications, such as internal hernias.

How much weight can you expect to lose?

At Healthier Weight, we expect our patients who have had an OAGB to lose at least 60-70% of their excess weight over the time period of 2 years, with the majority being lost within the first 12 months. 


    I'm happy to receive marketing email from Healthier Weight only. We never share or sell data with third parties.

    Share This Post

    Subscribe To Our Newsletter

    Get updates and learn from the best

    More To Explore

    Diet and nutrition

    The Health Benefits of Bariatric Surgery Beyond Weight Loss

    Reading Time: 2 minutes In recent years, bariatric surgery has gained recognition not only for its remarkable impact on weight reduction but also for its complex health benefits that extend beyond shedding excess weight.

    Get a FREE consultation by calling
    0800 3134618 
    Get a quote 
    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Your personal data will be used for the personalization of ads and cookies may be used for personalized and non-personalized advertising. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit “Cookie Settings” to provide a controlled consent.  Read our cookies policy here