Why Am I Gaining Weight After Bariatric Surgery?

Weight regain after bariatric surgery can feel frustrating, even discouraging—but it’s more common than you think. And it doesn’t mean your surgery failed. The most important thing is to identify the cause and get the right support.

Here’s what you need to know:

Is Some Weight Regain Normal?

Yes. A small amount of weight regain—usually 5–10% of your lowest post-op weight—is completely normal, especially a few years after surgery.

Your body adapts over time, and natural metabolic changes can lead to slight increases in weight. If you’re within this range and feel well, it may not be cause for concern. Still, it's worth checking in with your bariatric team.

What Causes Weight Regain After Surgery?

Several factors could be contributing:

1. Changes in Eating Habits

Sometimes, it’s not about overeating—it’s about how or what you're eating. Overly restrictive diets can actually backfire and lead to:

• Slower metabolism
• Loss of lean muscle
• Cravings and rebound eating

Work with your primary care provider (PCP) or a dietitian to review your current habits and adjust in a sustainable way.

2. Exercise Routine Plateaus

Exercise plays a key role in weight maintenance, but not all workouts are equally effective.

A physical therapist or exercise physiologist can help you:

• Target fat-burning workouts
• Protect your joints
• Stay motivated with realistic goals

3. Stomach Pouch or Stoma Enlargement

Over time, your stomach pouch (or the stoma—the opening into the stomach) can stretch, allowing you to eat larger portions than before. This can happen naturally or due to behavioral habits like overeating or drinking while eating.

If this is the cause, minimally invasive outpatient procedures may help.

What If I’ve Gained a Lot of Weight Back?

If weight regain is significant and lifestyle changes aren’t helping, your doctor may recommend revision surgery. While effective, revision procedures:

• Carry a higher risk of complications
• Should be considered only after other strategies are tried

Your surgeon may suggest options like:

• Endoscopic procedures to resize the pouch
• Conversion to another bariatric procedure
• Nutritional and behavioral re-evaluation

What Should I Do First?

Don't wait until you feel stuck. If you’re concerned about weight regain, reach out to your bariatric team. A quick evaluation can:

• Identify the root cause
• Reassess your current habits
• Offer a customized solution that works for you

Support at Every Step – BASS Medical Group's Bariatric Program

At BASS Medical Group, we understand that weight loss is a journey—not a one-time event. Our bariatric specialists and surgeons are here to guide you through every stage, including setbacks.

• Find a Specialist
• Request an Appointment

You’re not alone—and you’re not starting over. Let’s find your way forward, together.