Obesity, cancer & the conversation we’ve been missing

When most people think about obesity, they think about weight. They think about appearance, dieting, fitness plans, confidence, and before-and-after photos. For decades, that’s largely how society has framed the conversation.

We’re constantly surrounded by messages promising fast weight loss:

• “Lose 30 pounds in 30 days”
• “Drop six inches fast”
• “Summer body”
• “Beach body”
• “Just eat less and move more”

Over time, obesity became reduced in our minds to a lifestyle issue—something temporary, something simple, something people should be able to overcome with enough discipline or motivation.

But medically, that’s not what obesity is. Obesity is a chronic disease that affects nearly every organ system in the body. And perhaps one of the most overlooked parts of that conversation is cancer.

Obesity and Cancer: A Real Medical Connection

Many people know obesity is associated with conditions, such as type 2 diabetes, high blood pressure, sleep apnea, joint disease, and heart disease. Fewer people realize obesity is also linked to increased risk for at least 13 different types of cancer, including:

• Colon cancer
• Liver cancer
• Pancreatic cancer
• Kidney cancer
• Esophageal cancer
• Uterine cancer
• Postmenopausal breast cancer
• Ovarian cancer
• Gallbladder cancer
• Thyroid cancer
• Multiple myeloma
• Meningioma
• Gastric cardia cancer

This relationship is not just about body size or appearance—obesity causes biological changes in the body. Excess adipose tissue (body fat) affects hormones, insulin levels, chronic inflammation, metabolism, and immune signaling. Over time, these changes can create an environment that increases cancer risk.

The Conversation Isn’t Really About Weight

Most patients struggling with obesity are not waking up each day thinking about fitting into smaller clothes. They are parents, grandparents, spouses, sons, and daughters—people trying to keep up with work, family, responsibilities, and everyday life.

Many are still actively living their lives:

• Going to work
• Farming
• Hunting
• Coaching ballgames
• Taking care of others
• Showing up every day

And because they are still functioning, it’s easy to believe things are “good enough.” But functioning and being healthy are not always the same thing.

Often, the body is compensating quietly in the background:

• Worsening insulin resistance
• Chronic inflammation
• Rising blood pressure
• Poor sleep quality
• Progressive metabolic disease

The consequences may not become obvious until years later.

The Part We Rarely Talk About

Diet and exercise matter. They absolutely improve health. But one of the biggest misconceptions in obesity medicine is the idea that severe obesity is usually cured long-term through lifestyle changes alone.

Short-term weight loss is common. Long-term durable remission of severe obesity is much harder. And this becomes especially important when we look at cancer outcomes.

Several major studies have shown that patients who undergo bariatric surgery experience:

• Lower overall cancer rates
• Lower obesity-related cancer rates
• Lower cancer-related death rates

Some studies have shown approximately:

• A 30% reduction in obesity-related cancers
• Nearly a 50% reduction in cancer-related mortality after bariatric surgery

What makes these findings particularly important is who these patients were compared against. These studies did not compare bariatric surgery patients to “unhealthy” people who received no medical advice. They compared them to patients of similar weight, age, sex, health background, and demographics.

Many of those patients were treated with standard recommendations, such as diet, exercise, and lifestyle modification. And despite those efforts, the surgery group still experienced significantly better cancer outcomes.

Some data also suggests that when patients develop the same stage cancer, those who previously underwent bariatric surgery may experience better outcomes during treatment and recovery. That changes the conversation substantially.

Bariatric Surgery Is Not About “Taking the Easy Way Out”

One of the most persistent stigmas surrounding bariatric surgery is the idea that it represents failure, weakness, or an “easy way out.”

But obesity is not a character flaw. It is not a lack of discipline. And bariatric surgery is not cosmetic treatment. It is metabolic and hormonal treatment for a chronic disease. Modern bariatric surgery has repeatedly been shown to be the most effective long-term treatment we currently have for severe obesity.

Beyond weight reduction, it can significantly improve, or even resolve, conditions such as:

• Type 2 diabetes
• Sleep apnea
• Hypertension
• Fatty liver disease
• Metabolic syndrome

And increasingly, evidence suggests it may also meaningfully impact long-term cancer outcomes.

A Different Way to Think About Obesity

For too long, obesity has been discussed primarily through the lens of appearance and shame. But the real conversation is much bigger than that.

This disease affects longevity, energy, mobility, family life, chronic disease, and potentially cancer risk and cancer survival. The goal is not to shame patients. The goal is to understand the disease accurately so we can treat it effectively.

For many patients, bariatric surgery is not simply about losing weight. It is about improving health, reducing disease burden, and increasing the chances of being present for the people who love them. That is a very different conversation than the one most people have been hearing for years.

Dr. Yaniv Cozacov is chief of surgery at Horizon Health and specializes in bariatric surgery.