Important Guide to the Gastric Bypass Diet

The importance of diet

Gastric bypass is not for everyone. You must first qualify for the surgery and understand the risks and benefits involved. Those who are eligible are typically more than 100 pounds overweight or have a body mass index (BMI) over 40. You may also be eligible if your BMI is between 35 and 40 and your health is at risk due to your weight.

To be a viable candidate, you should also be ready to relearn your dietary habits. New dietary habits can help the surgery have positive and lifelong effects.

Before your surgery, you need to make plans for a special diet to follow before and after the surgery. The presurgery diet is geared towards reducing the amount of fat in and around your liver. This reduces the risk of complications during the surgery. After the surgery, your doctor with tailor the general diet guidelines to you. The diet consists of several weekly phases. It helps you recover, meet the needs of your now-smaller stomach, and gain healthier eating habits.

Diet before your surgery

Losing weight before surgery helps reduce the amount of fat in and around your liver and abdomen. This may allow you to have a laparoscopy rather than open surgery. Laparoscopic surgery is less invasive. It requires much less recovery time and is easier on your body.

Losing weight prior to surgery not only keeps you safer during the procedure, but it also helps train you for a new way of eating. It is a lifelong change.

Your exact eating plan and preop weight loss goal will be determined by your doctor. Your eating plan may begin as soon as you are cleared for the procedure. If sufficient weight loss does not occur, the procedure may be cancelled or postponed. So, you should start the diet plan as soon as you can.


Guidelines vary from person to person, but may include the following:

  • Eliminate or decrease saturated fats, including whole milk products, fatty meat, and fried food.
  • Eliminate or decrease foods that are high in carbohydrates, such as sugary desserts, pasta, potatoes, bread, and bread products.
  • Eliminate high-sugar beverages, such as juice and sodas.
  • Exercise portion control.
  • Avoid binge eating.
  • Don’t smoke cigarettes.
  • Avoid alcoholic beverages and recreational drugs.
  • Don’t drink beverages with your meals.
  • Take a daily multivitamin.
  • Take protein supplements as protein shakes or powder.

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