Bariatric Surgery

Contact Information

65 Nielson St, #125, Watsonville, CA 95076

(831) 768-6266 | FAX: (831) 288-0897

Surgical Options for the Treatment of Obesity

Comprehensive, evidence-based surgical care for adults living with obesity and related medical conditions, with long-term support and individualized treatment plans.

Understanding Obesity

Obesity is a chronic, relapsing medical disease influenced by a complex interaction of biological, genetic, and environmental factors. It is not a matter of willpower or personal failure. The body’s systems that regulate weight, appetite, and metabolism can work against sustained weight loss, making obesity difficult to manage with lifestyle changes alone.

When obesity leads to serious health conditions or when non-surgical treatments have not been effective, bariatric surgery may be considered as part of a comprehensive treatment plan.

Health Conditions Linked to Obesity

Obesity increases the risk of developing several serious medical conditions. Surgical treatment may help reduce these risks and improve overall health. Common obesity-related conditions include:

  • Type 2 Diabetes and Insulin Resistance
  • High blood pressure and cardiovascular disease
  • Obstructive sleep apnea
  • Non-alcoholic fatty liver disease
  • Joint disease and mobility limitations
  • Gastroesophageal reflux disease

When Surgery Is Considered

Bariatric surgery is not appropriate for everyone with obesity. Surgery may be considered when:

  • Body Mass Index (BMI) is 40 or higher, or BMI is 35 or higher with obesity-related health conditions.
  • Non-surgical weight management approaches have not led to sustained improvement.
  • You are willing to commit to lifelong dietary changes and medical follow-up.
  • You have realistic expectations about outcomes and understand the risks.

Each patient is evaluated individually. Surgery is one tool in the comprehensive treatment of obesity, not a quick fix or easy solution. Success requires ongoing commitment and lifestyle modification.

Surgical Treatment Options

We offer evidence-based bariatric procedures tailored to your medical needs and goals.

Sleeve Gastrectomy

This procedure involves removing a portion of the stomach, creating a smaller, sleeve-shaped stomach. It reduces the amount of food you can eat at one time and may affect hunger hormones. Most procedures are performed using minimally invasive techniques.

Gastric Bypass

This procedure creates a small stomach pouch and reroutes a portion of the small intestine. It limits food intake and reduces calorie absorption. Bypass may be particularly helpful for patients with severe reflux or type 2 diabetes.

The choice of procedure depends on your medical history, anatomy, existing health conditions, and treatment goals. We will discuss which option may be most appropriate for you.

Expected Outcomes

Weight Loss

Most patients lose a significant amount of weight in the first one to two years after surgery. The amount varies by individual, procedure type, and adherence to dietary and lifestyle recommendations. Weight regain is possible, especially if nutritional guidelines are not followed.

Health Improvement

Many patients experience improvement in obesity-related conditions such as type 2 diabetes, high blood pressure, and sleep apnea. Individual results vary, and not all conditions resolve completely. Surgery is part of a comprehensive approach that includes long-term medical follow-up.

Lifestyle Commitment

Long-term success requires permanent changes to eating habits, regular physical activity, vitamin supplementation, and ongoing medical monitoring. Surgery changes your anatomy but does not eliminate the need for healthy behaviors.

What To Expect

Preoperative Evaluation

Before surgery, you’ll undergo a comprehensive evaluation that may include medical clearance, nutritional counseling, psychological assessment, and education about the procedure and lifestyle changes. This process helps ensure you are prepared for surgery and long-term success.

Hospital Stay

Most bariatric procedures require a one to two-day hospital stay. You’ll start with clear liquids and advance your diet gradually according to a structured plan. Pain management and education will be provided before discharge.

Recovery

Most patients return to light activities within two to three weeks and resume normal activities within four to six weeks. You’ll follow a staged diet plan, starting with liquids and progressing to solid foods over several weeks. Regular follow-up visits are essential to monitor your progress, adjust medications, and provide ongoing support.

Why Choose our Practice?

Surgeon-led care with individualized treatment planning. Evidence-based approach aligned with ASMBS, IFSO, and NIH guidelines. Coordination with nutritionists, psychologists, and your primary care team. Commitment to long-term follow-up and comprehensive support

Patient Forms

Our Providers

Rob Allen, MD

Rob Allen, MD

Dr. Allen joins us from Kaiser Permanente West Los Angeles, where he developed a strong reputation for delivering high-quality, patient-centered surgical care. He brings extensive experience, advanced training, and is board-certified in general surgery, including a Foregut Surgery fellowship at Keck Medicine of USC, with additional specialization in robotic and bariatric surgery. Originally from the East Coast, Dr. Allen is excited to transition to a community-based setting where he offers comprehensive care across the full spectrum of general surgery. His practice will emphasize bariatric surgery and both upper and lower endoscopy, including EGD and colonoscopy, allowing for streamlined, continuity-driven care from diagnosis through treatment.
Ryan Nolan, MD

Ryan S. Nolan, MD

Dr. Nolan is a board-certified general surgeon with fellowship training in advanced minimally invasive and robotic techniques. He is proficient with the DaVinci robot and other minimally invasive techniques to perform complex surgeries, including hernia repairs, colorectal surgery, upper GI procedures, and bariatric surgery. He earned his medical degree from the Keck School of Medicine at the University of Southern California and completed his general surgery residency at Cooper University Hospital in Camden, N.J., along with a fellowship in advanced minimally invasive surgery at Alta Bates Summit Medical Center in Oakland. ​