From Gila Monster to GLP-1 Revolution

In 1991, I left Seattle and moved to Phoenix to begin my career as a surgeon. In Seattle, hiking meant pine trees, damp trails, and reliable rain. In Phoenix, hiking meant bottled water and survival. The temperature could sit at 113 degrees at six in the evening. Sometimes the hills burned. The rocks looked brown and lifeless to my Northwest eyes.

At first, I didn’t like it.

However, the desert waits you out. Eventually, I saw what I had missed. The saguaros stood like cathedral columns. The light at dusk turned the mountains copper and rose. And slowly, I fell in love with it.

That desert is also home to the Gila monster. It moves deliberately. It carries venom in its bite. It looks ancient and unbothered by your opinion. Towns carry its name. A river carries its name. The land itself honors this creature.

At the time, I did not know that the Gila monster would eventually change my life.

Meanwhile, in a Laboratory

In 1990, researchers isolated a peptide from Gila monster venom. Two years later, work from the Bronx VA Medical Center described exendin-4, a molecule that resembled human GLP-1 but lasted far longer in circulation.

Human GLP-1 survives only minutes before the body breaks it down. Exendin-4 resisted that breakdown. That difference changed everything.

Soon afterward, the first GLP-1 receptor agonist reached patients under the brand name Byetta. At the time, physicians used it to treat diabetes. No one called it a weight-loss drug. No one predicted it would reshape obesity medicine.

And yet, the foundation was already in place.

While I Was Operating

Success after weight loss surgery doesn’t end with an operation. It just gets started

At the Phoenix Indian Medical Center, I performed weight loss surgery in a population with some of the highest rates of type 2 diabetes in the world. Researchers there studied metabolism intensely. The “thrifty gene” hypothesis gained traction in that environment. Scientists asked whether efficient energy storage, once protective in scarcity, became harmful in abundance.

At the same time, I watched something remarkable in the operating room. After gastric bypass, patients’ blood sugars often improved within days, before meaningful weight loss occurred. Hormones were shifting. Physiology was driving outcomes.

Meanwhile, GLP-1 drugs evolved.

Researchers lengthened their half-lives. Chemists modified their structures so they bound albumin and stayed active for days rather than minutes. Clinical trials expanded. Safety data accumulated.

Eventually, semaglutide showed average weight loss approaching fifteen percent of body weight in obesity trials. Then tirzepatide, now marketed as Zepbound for obesity, exceeded 20 percent weight reduction in higher-dose studies. In addition, cardiovascular outcome trials demonstrated reductions in major adverse cardiac events in high-risk patients.

These were not cosmetic results. These were metabolic and cardiovascular outcomes.

Food Noise

Patients rarely talk about receptors. They talk about noise.

Food noise.

The constant internal dialogue about eating. The mental pull toward the pantry. The background chatter that never quite stops.

GLP-1 receptors exist in appetite-regulating areas of the brain, including the hypothalamus and brainstem. These medications act through vagal signaling and through regions where the blood-brain barrier is more permissive. As a result, they modulate satiety and reward pathways.

Consequently, many patients report something simple but profound: the noise quiets.

Not disappears. Quiet.

That distinction matters.

Diet Culture Pushback

Predictably, not everyone celebrates this shift.

Diet culture thrives on the belief that weight reflects character. Some coaches insist the solution is fewer calories. Others argue for more beef, more butter, more fiber, or stricter discipline. Entire industries depend on the idea that trying harder solves everything.

However, biology does not negotiate with virtue.

Obesity is a chronic, relapsing, neurohormonal disease. No one worked harder at weight loss than many of my surgical patients. Likewise, I do not lack willpower. And I practice culinary medicine. Preaching and eating a Mediterranean diet.

Nevertheless, effort alone does not silence dysregulated signaling.

Calling GLP-1 therapy “cheating” misunderstands the science. These medications restore signaling. They amplify satiety. They reduce excess reward drive. They support physiology.

That is treatment, not moral compromise.

My Parallel Universe

When I began my career, I weighed about 185 pounds. Years later, hospital cafeterias, exhaustion, and irregular meals pushed me to 225. I understood obesity clinically. Then I understood it personally.

In one version of my career, revision surgery remains the answer for weight regain. In this version, I reached for GLP-1 therapy instead.

Today, I weigh what I weighed when Nixon was president.

I am both surgeon and patient.

And your reporter.

A Necessary Caution

GLP-1 medications carry risks as well as benefits. Nausea can occur. Gastric emptying slows. Gallbladder disease risk may increase, although obesity itself already raises that risk substantially. Physicians must monitor dosing carefully.

Therefore, if you consider GLP-1 therapy, work with a trained physician who understands obesity medicine. Avoid quick online scripts. Seek supervision. Demand follow-up.

Metabolic medicine deserves serious care.

The Desert Was the Beginning

I once thought Phoenix was punishment. The heat felt relentless. Even Satan might choose a cooler vacation. Only Canadians brave July—and who can blame them?

However, what felt like exile turned out to be preparation.

In that same desert, I learned surgery. Researchers debated the thrifty gene. A venomous lizard carried a peptide that would become modern metabolic therapy.

I thought I had been sent to hell. But I found beauty in the desert, and by the time I left Arizona, I missed it terribly.

Little did I know I was sent to the future in Arizona.