Quick fixes fade. Lasting change begins here.

Trusted bariatric surgeons in Walnut Creek & Brentwood — 20+ years of experience, 2,000+ life-changing results.

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MBSAQIP Accredited CenterASMBS American Society for Metabolic & Bariatric Surgery
Smiling woman confidently showing her weight loss by wearing oversized jeans after bariatric surgery, symbolizing health and transformation.
Logo for BASS Medical Group's Bariatric Surgery & Weight Loss Management Services.

About BASS Medical Group Bariatric Surgery & Weight Management

Serving patients across California with clinics in Walnut Creek and Brentwood

At BASS Medical Group, our bariatric surgeons have been helping patients achieve lasting weight-loss success since 2002. With more than 2,000 procedures performed, our team brings extensive experience, collaboration, and attention to detail that ensures safe, effective outcomes.

Our patients consistently achieve greater weight loss than the national average, with complication rates significantly lower than most programs. More importantly, many describe their results as truly life-changing — restoring health, energy, and confidence.

Call 925-940-1052

Patient Success Stories

Bariatric Surgery & Obesity Specialists | Weight-Loss Surgery Center clinics in Walnut Creek and Brentwood California
Before Surgery
After Surgery

My Weight-Loss Surgery Success Story

My name is Denise. I started my weight-loss journey in December of 2014 by visiting Dr. Chin. It was ten months of doctors’ appointments, weigh-ins, and medical tests. But I was focused and determined. Finally, my surgery date came. I was sleeved in October 2015, and it was the best decision I have ever made for myself. I was 57 years old at the time. I asked my surgeon, Dr. Chin, if I was too old for the surgery, and he said, “No one is too old to get healthy.” He was so very right. I was 310 pounds at my heaviest, pre-surgery. I was pre-diabetic, and had high blood pressure. My back, knees, and ankles hurt most of the time, and I was always short of breath. Those were just the medical conditions I had because of my weight. I was self-conscious and depressed. I was very unhappy. Surgery was a piece of cake (no pun intended). I was walking on the treadmill within two days. Soon, I was amazed at the transformation I was having, both in my weight loss and with my attitude towards food. As the weight loss kept happening, I was gaining my health back. I am no longer on blood pressure medicine, and I am no longer pre-diabetic. My knees, back, and ankles don’t hurt anymore because I am not carrying so much weight. I can walk and move around without being short of breath. My confidence has returned, and I am so much happier now that I am 100 pounds lighter. I swim a mile five days a week, and walk three to four miles every day, and I enjoy it. There are so many accomplishments that have come from losing weight like shopping in the regular size section, fitting in any chair, crossing my legs, not having to ask for an extension on the airplane, and the list goes on. The only regret I have is not having this surgery sooner. I would like to thank Dr. Chin and all of the staff involved in my life saving/changing surgery.

Denise Brown
Past Bariatric Surgery Patient

More Obesity Surgery Success Stories

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Gastric Sleeve Surgery Helps Patient Lose 120 Pounds and Kick Diabetes

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57-year-old Gastric Sleeve Patient Drops 100 Pounds After Surgery

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What our patients are saying

Excellent 4.8 out of 5 star rating

95 lbs Lost – A Truly Life-Changing Journey

Dr. Chin and all the staff were amazing. I had my gastric sleeve surgery in August 2021, and I have lost 70 lbs in the last 7 months. It’s the best thing I could have done for my health and myself. It requires mental determination and strength, but it’s totally worth it. Everyone treated me with respect, patience, and compassion after my surgery. Their level of professionalism and care was outstanding. If you are looking for a good surgeon who will do the surgery right, Dr. Chin is the one. You won’t regret it.

Update: It’s been 2 ½ years since my surgery, and I’ve lost about 95 lbs. I continue to go every 6 months to see Dr. Chin to keep myself in check and maintain my weight. He has also used my weight-loss story as a success story on YouTube. I’ve met people who have seen my video and success, and I love to encourage them by reminding them that you have to train your mind for success! You can see the pictures before and after! Trust me when I say this—it’s not an easy process, but it’s truly life-changing as long as you set your mind to it!

Geeky Chica
Bariatric Surgery Patient

Friendly, Knowledgeable, and Supportive Team

Doctors and Nurses are very friendly,  knowledgeable, and patient. They explained everything in advance and answered all of my questions. I am so glad I chose Bass Bariatric Surgery Center!

Julie V.
Bariatric Surgery Patient

Dr. Chin Saved My Life – 179 lbs Lost!

I’m disabled, so I found BASS Medical Group and Dr. Chin through the Medicare website. Insurance is so tricky. Dr. Chin is amazing—he takes real pride in helping people transform and become healthy. I’ve seen it, and I’m living it. The gastric sleeve is the best tool you can ever give yourself to help lose it and keep the weight off. Everyone is different, but for me, in 2 years I lost a total of 179 lbs, and it feels great! Dr. Chin saved my life and helped transform me into a healthy person. I couldn’t be more grateful! Thanks, Dr. Chin.

Ohyeah420
Bariatric Surgery Patient

Bariatric Procedures

Bariatric Surgery & Obesity Specialists | Weight-Loss Surgery Center clinics in Walnut Creek and Brentwood California
Weight-Loss Procedure

Gastric Sleeve

In a sleeve gastrectomy (gastric sleeve), a majority of the stomach is separated and removed from the body. The gastric sleeve involves removing a portion of the stomach.

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Weight-Loss Procedure

Gastric Bypass

In the roux-en-Y gastric bypass, the surgical team at BASS Medical Group partitions the stomach, creating a small upper pouch and a large lower pouch referred to as the gastric remnant.

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Weight-Loss Procedure

Gastric Band

Commonly known as the lap-band, a rubber-like ring containing an inflatable balloon is placed around the upper part of the stomach and affixed in place. This creates a small stomach pouch similar to the small pouch created surgical lyin the gastric bypass procedure.

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Weight-Loss Procedure

Duodenal Switch

This procedure begins with a sleeve gastrectomy. The valve that releases food to the small intestine is left, along with the first part of the small intestine, called the duodenum. The surgeon then closes off the middle section of the intestine and attaches the last part directly to the duodenum.This is the duodenal switch.

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dr brian chin with bariatric surgery patient before surgery begins
BASS Bariatric Weight-Loss Surgery Logo

Life after Bariatric Surgery

Most patients spend just one night in the hospital and are discharged the next day. Because the operation is performed laparoscopically, pain is usually well controlled with oral medication. Some may experience temporary “gas pain,” which improves within a day or two.

Key steps after surgery:

  • Begin walking the same day (helps relieve gas pain and reduces risk of blood clots).
  • Start with sips of water → then clear liquids.
  • If tolerated, progress to full liquids (soups, broths) the next day.
  • Nurses will encourage frequent walking in the halls.

Most patients stay on a full liquid diet for two weeks after surgery. Gradually increase walking distance each day to build stamina.

Recovery timeline at home:

  • 2 weeks → Follow-up visit, may begin soft solids if cleared by your surgeon.
  • 2–6 weeks off work → Depending on job demands (desk jobs often return sooner).
  • 4+ weeks → Light gym activity (weights, swimming, yoga) may resume if approved.
  • Continue walking daily as the foundation of recovery.

Follow-up care is essential for long-term success and safety.

Your schedule:

  • 2 weeks post-op → Initial check with your surgeon.
  • 3 months, 6 months, 12 months → Weight, blood work, and nutritional status checked.
  • Yearly → Ongoing monitoring and support.

Nutritional care:

  • Take a daily multivitamin for life.
  • Additional supplements prescribed if needed.
  • Nutritionists available for diet adjustments and questions.

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