How Much Weight Can You Lose with Gastric Bypass?

The amount of weight you can lose with gastric sleeve surgery varies depending on a number of factors, including your age, sex, and starting weight. However, on average, most people can expect to lose around 60–70% of their excess body weight within the first year after the surgery.

What Is Gastric Sleeve Surgery?

Gastric sleeve surgery, also known as sleeve gastrectomy, is a weight loss procedure in which a large portion of the stomach is removed, leaving a smaller, sleeve-shaped stomach about the size of a banana. This smaller stomach can hold about one cup of food, which means you'll feel fuller faster and eat less overall.

The Procedure

The surgery is typically performed laparoscopically — a few small incisions, a camera, and specialized instruments to remove the portion of the stomach. Recovery time is usually around 2–4 weeks.

After Surgery: Diet and Lifestyle

After the surgery, you'll need to follow a strict diet to help your body heal:

• Start with a liquid diet for the first few weeks
• Gradually move to pureed and soft foods
• Transition to a regular bariatric diet
• Take supplements to ensure adequate nutrition
• Exercise regularly to speed up weight loss and improve overall health

Most people can expect to lose a significant amount of weight within the first year, with long-term success depending on adherence to diet and exercise recommendations.