Obesity And Cancer Risk Explained

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What if the biggest levers for lowering cancer risk were already on your to‑do list? We unpack the real numbers behind smoking and obesity, separate hype from evidence, and explain how hormones, insulin signaling, and chronic inflammation turn excess adiposity into a cancer‑friendly environment. The goal isn’t fear; it’s clarity and action you can take now.

We walk through the 13 cancers linked to obesity and highlight where the evidence is strongest: a sevenfold rise in endometrial cancer with severe obesity, doubled liver cancer risk in the presence of fatty liver disease or viral hepatitis, higher rates of postmenopausal breast cancer, and increased colorectal cancer risk. You’ll hear why women face a greater overall link due to estrogen pathways, how early‑onset and long‑duration obesity compound lifetime risk, and why cancer mortality rises at higher BMI even when the tumor’s cause lies elsewhere. Along the way, we cut through confusion on screening: mammography starting at 40, colorectal tests beginning at 45 with options from colonoscopy to FIT, one‑time hepatitis B and C screening, and targeted liver ultrasound when MASLD or viral hepatitis is present. For pancreatic cancer, we flag symptoms that warrant imaging despite the lack of routine screening.

We also get practical about prevention. If you smoke, cessation remains the single strongest step to reduce cancer and cardiovascular risk. For weight and metabolic health, think protein‑forward, fiber‑rich meals; resistance training to protect lean mass; better sleep; treatment for sleep apnea; and evidence‑based medications or surgery when appropriate. These changes lower insulin and estrogen exposure, tame inflammation, and shift your internal chemistry away from tumor growth. Our conversation is candid, compassionate, and grounded in what actually moves the needle for real people with busy lives.

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Transcript

Welcome And Scope Of The Show

Dr. Lindsay Ogle, MD 0:01

Welcome to the Modern Metabolic Health Podcast with your host, Dr. Lindsay Ogle, a board certified family medicine and obesity medicine physician. Here we learn how we can treat and prevent modern metabolic conditions such as diabetes, PCOS, fatty liver disease, metabolic syndrome, sleep apnea, and more. We focus on optimizing lifestyle while utilizing safe and effective medical treatments. Please remember that while I am a physician, I am not your physician. Everything discussed here is provided as general medical knowledge and not direct medical advice. Please talk to your doctor about what is best for you. When it comes to cancer risk, is obesity the new smoking? As a physician who was trained in primary care, preventative health screenings, including cancer screenings, are a very important part of my practice and something that I'm very passionate about. And also modifying risk factors for cancers and chronic conditions that can shorten or negatively impact somebody's life. And cancer and obesity are two of those risk factors that are extremely prevalent in our population. And we all know by now that smoking negatively impacts our health. It increases our risk for many types of cancers, and most notably lung cancer, but also esophageal cancer, mouth and neck cancers, kidney cancers, and many other cancers, bladder cancer, and it also increases our risk of cardiovascular disease, stroke, and many other health conditions. Obesity actually does the same thing. Many people are aware of the metabolic impact of obesity and its association with chronic conditions like type 2 diabetes and polycystic ovarian syndrome, but it's less commonly known that obesity increases risk of cancer. And there are at least 13 well-documented unique cancers that obesity increases somebody's risk for. So by decreasing or stopping smoking, achieving and maintaining a healthy weight, decreasing your risk of many different types of cancers, decreasing your heart disease and stroke risk, as well as diabetes and other chronic conditions. So, in my humble opinion, as a family medicine and obesity medicine physician, two of the best things that you can do for your health are to never smoke or stop or reduce your smoking now and achieve and maintain a healthy weight. And this is something that your primary care doctor andor an obesity medicine doctor can help you achieve. There is a lot of hope and treatment available for both of these things. So do not be afraid to ask for help. I'm going to include some links below to get assistance with smoking cessation as well as obesity care. But today I in this talk we're going to explore that association between obesity and cancer risk. But to answer the initial question, is obesity the new smoking when it comes to cancer risk? No, it's not. Smoking is still the most significant modifiable risk factor when it comes to cancer. Smoking is responsible for approximately 19% of cancers in the United States, and it's responsible for 28% of cancer-related deaths in the United States. Compare that to obesity, which accounts for approximately 7 to 8% of both cancers and cancer-related deaths in the United States. We're going to go over what those 13 cancers are and why there is an association and some things that you can do to screen for those cancers or watch out for any signs or symptoms. But before we get there, I also want to highlight some compounding risk factors to be aware of. So that association with obesity and cancer is disproportionate for a couple of different populations. And the first one I want to address is for females. The association between cancer and obesity is stronger in women. And this is thought to be hormonally related because many of the cancers that are more common in women can be triggered by estrogen and hormone levels. So about 5% of cancers in men are related to obesity compared to 11% of cancers in women are related to obesity. So that's a very pretty big difference between the two genders. The association between obesity and cancer is also exaggerated and compounded. The earlier somebody starts to struggle with the disease of obesity. So if you have struggled with weight as a young kid or young adult and you've been dealing with this for decades now, that is going to over time have increased your risk for many of these cancers. So that's something that's important to be aware of compared to someone who later in their life started to struggle with weight. As with many chronic conditions and medical concerns, race unfortunately plays a factor, both from a genetic standpoint as well as structural systems that we live in. And so non-white populations are at a higher risk for obesity-related cancers. And then anybody who has both obesity and a metabolic condition is at higher risk of developing obesity-related cancers. Another thing I would like to highlight is that despite what the underlying cause of a malignancy or a cancer is, somebody that is living with obesity is going to have disproportionate outcomes compared to somebody who has a quote unquote normal BMI. Individuals with cancer who have a BMI of 40 or greater have a higher chance of mortality compared to somebody with a similar condition who has a BMI of 25 or less. The relative percentages for that are men with a BMI of 40 or greater have about a 50% increased mortality than somebody with a BMI of 25 or less. And for women with a BMI of 40 or greater have a 60% increased mortality compared to their counterparts with a BMI of 25 or less. So now let's talk about what those 13 types of cancers are. I'm gonna start with the one with the strongest association with obesity, and that is endometrial or uterine cancer. And women who have a BMI of 40 or greater are at seven times that risk of endometrial cancer compared to women with a BMI of 25 or less. Seven times the increased risk. So there is a very strong association, and this is because of the increased estrogen that obesity lends itself to. Next is liver cancer. And individuals who are living with obesity are two times as likely to have liver cancer as other individuals. This is something that we do not have screening guidelines as of now for people who are living with obesity. But if somebody has mastled metabolic dysfunction-associated steatotic liver disease, also commonly known as fatty liver disease, or a history of hepatitis C or hepatitis B, they should be getting periodic liver ultrasounds, which would be a way of screening for liver cancer. All individuals, regardless of your infection risks, should be screened at least once for hepatitis B and hepatitis C. The next cancer associated with obesity is postmenopausal breast cancer. All women, regardless of risk, should start getting breast cancer screening around age 40, and most people should repeat this annually. There are some variations in different societal guidelines about when to start and how frequent and what modality to use based on certain risk factors or results on the initial mammogram. So talk to your primary care or OBGIN or you know radio breast radiologist about what is recommended for your case. But at age 40, you should start getting the screening done. And it's important to continue until about age 74. Again, that can look different from person to person. But if you are at increased risk because of family history, then you may start screening earlier. And if you are extremely healthy, you may continue to screen later than 74. Colorectal cancer is also associated with obesity. Colorectal cancer is one of the most common cancers in adults. It is one that we start screening for for the average risk person at age 45, and there are several different ways that we can screen for colon cancer with colonoscopy or cola guard or fit testing with just stool testing so you don't have to go through a procedure. Talk to your doctor about what is a best fit for you. But it is very important that everybody start screening for colon cancer at age 45. But especially if you live with obesity, you need to start screening because you are at higher risk for colorectal cancer. And again, if you have a strong family history of colon cancer or cancers in general, talk to your doctor because you may need to start screening earlier. And also if you have Crohn's disease or ulcer colitis, then you also should start screening earlier. Pancreatic cancer is associated with obesity. This cancer is really difficult to diagnose at early stages because it typically doesn't have that many symptoms. Something that people typically present for is that they feel full on less food. And that's also the case for individuals on a GLP1 medication. So this can be tricky to differentiate. If you have any abdominal pain, if you're losing weight very quickly, if you are very full, you know, when you're eating meals, even if you're on a GLP 1 medication, talk to your doctor because you may need to be screened for this. This pancreatic cancer is not something that we routinely screen for in everybody at this time. But if you're having certain symptoms, then it may be worth getting some imaging of your abdomen to rule this out. The remaining cancers are other cancers that we do not have guidelines recommending routine screening and have extremely variable presentations. That includes kidney cancer, gastric or stomach cancer, gallbladder cancer, thyroid cancer, meningioma, which is a brain cancer, and multiple myeloma, which is a blood cancer. So all of those cancers are also associated with obesity and have various diagnostic criteria and workup. So why does this association exist between obesity and cancers? And this is related to the adipose cells, the fat cells. As I've mentioned before, fat cells are not just there, they are not inert, they release hormones and inflammatory markers and signals throughout the body. And it is those signals and those hormones that can trigger and encourage cancer cells to grow. And that happens from the hormonal level, like I mentioned. So that is often related to increased insulin levels, increased leptin, decreased adiponectin. Those can be growth signaling on those changes, and that can encourage cancer to continue to grow. Estrogen, as I mentioned earlier, is released by adipose tissue. And so for estrogen-related cancers, this is a major factor in the development of those cancers. Odipose cells also release inflammatory markers, and that chronic inflammation can be a trigger for cancer growth. So I don't want this to scare or alarm anybody, but I just want to be honest about what the true risk factors are for having excess adiposity. It is not about how somebody looks.