What Nobody Tells You About Bariatric Surgery

The real results after bariatric surgery: weight loss, diabetes remission, cancer risk, mortality, mental health, relationships, and the parts nobody discusses. Most conversations about bariatric surgery stop at the number on the scale. That is the least important thing that happens to you. In this video I walk through the complete picture of what actually changes after metabolic and bariatric surgery, including the outcomes patients are never told about before they make the decision. This covers what the research shows on weight loss, type 2 diabetes remission, high blood pressure, sleep apnea, fatty liver disease, cancer risk, life expectancy, mental health, body image, relationships, fertility and pregnancy, employment and income, joint pain and mobility, bone density, and the early physical side effects that scare people in the first three months.

By Nestor de la Cruz‑Muñoz, MD, FACS, DABOM — Bariatric & Metabolic Surgeon


Video Transcript

Weight loss is actually the least interesting thing that happens to you after beriatric surgery. People talk about the pounds. They talk about the before and the after photos. They talk about the diabetes disappearing and the blood pressure dropping. Nobody talks about the other side. No one talks about the nausea that can flatten people at week one. No one talks about the hair loss that terrifies people in month three. Nobody talks about the marriages that get stronger and the ones that don't survive it. No one talks about the patients who wait too long and permanently lose benefits that they could have had. And almost no one talks about the fact that this is one of the most powerful cancer prevention tools we have ever had. That last one deserves a number. 30,000 patients. Cancer deaths cut nearly in half. But here's the part that could stop you cold. In that study, the two groups looked identical for the first six years. The protection didn't show up until year six. And that clock doesn't even start until you start it. So if you're sitting here right now thinking maybe next year, maybe when things settle down, understand that waiting has a price. You can't see it or feel it while you're paying it. So here's what I'm going to do today. The real results, the good, the bad, the expected, the rare, the life-changing, and the uncomfortable. Not the marketing version, not the influencer version, the medical version. Because if you're making a decision that affects the next 40 years of your life, you deserve the truth. Let me start with a patient. I had a patient, a woman in her 40s, two kids, worked as a school administrator. She came to me for one reason and she said it out loud in the first five minutes. She wanted to lose 100 pounds before her son's graduation. That was the goal. That was the whole goal. So, we did the work, nutrition, psychology, labs, the whole pathway. And she had a sleeve and she did beautifully. Lost the weight, made it to the graduation, great. But that's not the part that I remember the most. At 14 months out, she came for a follow-up visit, sat down, and said, "Doctor, I need to tell you something, and it's going to sound strange." She then went and said, "I stopped taking my blood pressure pills 6 months ago because I didn't need it. My hemoglobin A1C is normal. My CPAP is in the closet. I walked the whole zoo with my grandchild last weekend, and I didn't sit down once." Then she stopped. She got quiet and she said, "And I don't leak anymore when I laugh." I hadn't told anyone that. Not my doctor, not my husband. 20 years and I never told anyone. And then she said the sentence that I think about all the time. She said, "Nobody warned me about any of the good parts." And she's right. Nobody does. We hand out our brochure about pounds and we skip the entire rest of it. So today, we're not skipping it. Let's go. All right. Let's talk about the weight and get it out of the way because everybody wants to heal with it. Let's deal with the number because you're going to keep wondering about it until I do. So most patients lose anywhere in the range from 25 to 35% of their total body weight and the low point lands somewhere around 18 to 24 months. Not at one month and not at 3 months like a lot of patients would like. Almost 2 years of a slow, steady, and sometimes frustrating slope. Now the long term in the 15-year and beyond study of gastric bypass patients, weight loss stayed durable. In the Swedish study that followed people for 20 years, patients kept off more than a quarter of their total weight two decades later, two whole decades. But I'm going to tell you the honest part because you're going to hear it from someone eventually. And I'd rather be me. Almost everyone regains some. And that's not failure, that's biology. Your body has a set point and it's going to negotiate with you for the rest of your life. The goal was never a number on a Tuesday. The goal was durable. And durable is what the data show. All right, here's the part. That's the part that everybody talks about. Now, let's go into everything else. Let's talk about the diseases. This is the real operation. I want you to stop thinking of this as weight loss surgery for the next little bit and start thinking of it of as a disease surgery. Let's talk about diabetes. Up to threearters of the patients go into remission in the short and medium term. And at 20 years, somewhere between roughly a third and half the patients are still in remission. So, let that sit there in your brain for a second. 20 years later, and here's the part that amazes me. After all these years, a lot of the patients come off insulin within days, not after they lose the weight, but before. That's the hormones acting, not the pounds. Blood pressure, three out of four patients go into remission of their hypertension. Cholesterol, roughly seven out of 10 get normalized. Sleep apnea, and this one is enormous. In pulled data, 90 to 96% remission. If you're sleeping with a mask on your face tonight, that number's for you. Okay, reflux. In that long-term bypass study, 97% of patients had their reflux improved or resolved. Fatty liver, and I want to spend a second here because nobody talks about the liver. 80% of patients with MASH, and that's the inflamed form of fatty liver, had it resolved within a year with no worsening of the scarring. And that held out as as far as five years that they've seen. And there was a randomized trial called the Brave study that compared surgery to lifestyle plus best medical care and surgery was three and a half times more likely to resolve the disease. That's a liver that was on a path towards cerosis and getting it turned around. Kidneys and small uh blood vessels. Early kidney disease can go into remission and over and over 20 years microvascular events that's the eyes, the kidneys, the nerves drop by more than half, 56%. the big vessel events drop by a third. Now, here's the honest caveat, and you're going to hear me say some version of this all day. Remission is not immunity. In seven-year data, some of the diabetes and blood pressure remission erodess between years three and seven. Some people get it back, but even the people who get some of it back are in dramatically better place than they were when they started. That's not a loophole. That's a chronic disease management. We do the exact same thing with heart failure, and nobody calls it a failure. So let's talk about the years and what changes. Now I want to talk about dying and I'm going to use small words because this is the section that changes minds. Across the biggest studies that we have people who have had this surgery roughly 40% less likely to die from anything at all during the follow-up period. Any cause, not just obesity causes anything. Deaths from heart disease specifically was cut roughly in half. Death due to diabetes goes down 59%. And then there's a study of about 190,000 Medicare patients. And I want to give you these three numbers slowly. New hospitalization for heart failure down 54%. Heart attack down 37%. Stroke down 29%. Now, here's my favorite statistic in the entire field, and I'm going to explain it in the simplest way I know how. Researchers calculated something called the number needed to treat, and it answers this question. How many people do I need to operate on to prevent one major cardiovascular event, one heart attack or stroke or death within three years? And the answer was only 15. That's a staggeringly good number in medicine. There are medications we hand out to millions of people where that number is in the hundreds. And when you add it all up, the average patient gains something on the order of about six years of life. Six whole years. What would you do with that much time? And for diabetics, it's 9.3 years. All right, let's talk about cancer. Nobody talks about this, and I want to know why, because it might be the most important thing in this entire video. There's a study called the Splendid 30,318 patients. Surgical patients matched against non-surgical patients and followed for years. Obesity associated cancer, that's a group of 13 different types of cancers seen more often in patients with obesity. It was 32% lower in the surgery group. Cancer death was 48% lower, cut almost in half. And there's a separate cohort out of Utah, almost 22,000 patients, and what they found was a 25% lower risk of any cancer at all. And in women, a 41% lower risk of obesity related cancers. Endometrial cancer or uterine cancer is the one that shows up over and over again in every single study. It's the cancer most tightly linked to obesity and it's the cancer that drops the most dramatically after surgery. Now, do two details about that data that I think about constantly. First, sleeve and bypass performed essentially the same. Uh the survival curve sat right on top of each other. What that tells us is it probably isn't a clever rerouting trick of the intestines protecting you. is the weight loss itself, which means the amount of weight you lose, whether you keep and whether you keep it off actually matters for your cancer risk. And second, and this is the one that should get you off the couch. The curves didn't separate until about 6 years after surgery. The protection is real, but it's not instant. It takes time to accumulate. That means waiting has a cost that you can't see and you can't feel. And I'll be straight with you about the limit of what we know. In the Swedish study that followed for almost 27 years, the reduction in cancer showed up clearly in women but not in men. We don't fully understand why yet, and I'm not going to pretend that we do. All right. Now, let's talk about the stuff you'd notice on a Saturday. In a large group of pain and function, 50 to 70% of patients had a clinically meaningful improvement in body pain, physical function, and the actual measured walking test. Not how they felt about walking, but measured walking. of the patients who came in with severe knee and hip pain, about three quarters got meaningfully better. There's a review showing a 79% reduction in being diagnosed with osteoarthritis with real improvement in pain and stiffness scores at 6 and 12 months. In the 20 years Swedish data, surgery did two separate things for joints. It helped patients recover from work limiting knee and ankle pain and prevented new work limiting pain from ever started recovery and prevention. An honest caveat is has to be an important one. Patients as a group still report more pain than the general population. And at three years about one in three still are taking something for back or leg pain. This operation is not about joint replacement. It takes the load off the system. It's not going to undo the damage that was already there, which is again an argument about timing. Now, let's talk about muscle because there's a lot of fear here and a lot of nonsense online. Yes, you lose some muscle. Everyone does. But when you look at the actual research, the muscle loss is largely proportional and largely adaptive. You have a smaller body and a smaller body needs less scaffolding. Your muscle mass relative your size goes up and your physical performance improves. Here's my favorite number in the section. In a group of middle-aged women, the prevalence of sarcopenic obesity, that's the dangerous condition, combining too little muscle and too much fat, went from 89% before surgery to 3% in one year. 89 down to three. But that outcome is not automatic. It's earned. Protein and resistance training. And I'll come back to that at the end because it also protects something else you're not thinking about. I'm gonna give you some good news and the hard news in the same section because you deserve both and you're not going to get them anywhere else. Depressive symptoms improve across 13,146 patients. They improve significantly and the peak effect lands somewhere around 5 to 12 months. The catch is that the effect fades somewhat over time. Anxiety improves faster than depression and about 42% lower odds of anxiety symptoms. and it happens early. Depression is slower. In one study, the depression response didn't fully show up until about a year out. So, if you're six weeks posttop and you're wondering why you don't feel euphoric yet, that's normal. The timeline is documented. Binge eating and disordered eating symptoms improve significantly. And here's the one that surprised me. Cognition, thinking. A meta analysis found improvement in memory, attention, and executive function. Another study found a reliable cognitive improvement in about 44% of patients at six months and it tracked with drops in inflammatory markers in leptin, not with how much they exercised. Imaging work has even shown increased hypocampo volume and activation as visceral and liver fat went down. Let's listen to that again. The brain fog that people describe with obesity appears to at least partly be reversible. And now the hard news, and I'm not going to soften it. Alcohol use disorder risk goes up after surgery, not immediately. It climbs starting year two to five, and it's the highest after gastric bypass. Alcohol hits you differently after this operation, faster and harder. And for some people, that becomes a problem where it didn't exist before. And suicide and self harm risk is roughly doubled compared to what you'd expect. The strongest predictors were being male, having a prior psychiatric history, and having trouble sleeping. I tell you this not to scare you out of surgery, but I tell you because there are treatable, preventable, and screenable problems. And the only version where this goes badly is the version where nobody's watching. If you have a psychiatric history, that's not a reason not to be denied this operation. It's the reason to build a team around you before you ever get on the table. There's a whole category of results here that don't fit into a lab report. Self-confidence, self-esteem, self-worth. They improve and they improve in a way that shows up in real life in how people communicate and how they move through social situations. But there's a pattern in the data I want you to know about ahead of time because knowing it will protect you. The psychosocial peak happens in year 1, right along the peak with weight loss. And then a lot of those measures decline from year 1 to year six before stabilizing. There's a honeymoon and then there's real life. And we know what drives a dip. Three things show up over and over again. excess skin, weight expectations that didn't get met, and weight regain. Those are the documented drivers of depressive symptoms coming back at 12 to 24 months. So, let me put a flag in the ground right here. If your entire plan for feeling okay about yourself is contingent on a number, the number is going to eventually let you down. Build the identity while you're building the body. This is not a motivational poster. This is what 12 to 24month data is telling us. All right, this section is the one that gets me the most comments, and I'm going to say it plainly. The surgery changes your relationships measurably. In a study of 29,234 gastric bypass patients, among the people who were married going in, there was a 41% higher incidence of divorce. And among people who were single going in, there was a 35% higher incidence of getting married. Same operation, opposite directions. Here's what's really going on. Both effects were stronger in the people who lost more weight. And the single strongest predictor of separation was having poor family relationships before surgery. So what's actually going on here? The operation doesn't break up good marriages. It applies pressure to a relationship and the relationship reveals what it already was. Some partners walk beside you. Some partners were relying on you staying exactly the way you were. And when you start standing up for yourself at the dinner table, in your calendar, in your own life. Some relationships can't stand that. If you're married, bring your partner to the consultation, not as a courtesy, as part of the workup. This is one of the very few complications to buriatric surgery that we can genuinely prevent by having a conversation ahead of time. If you're a woman who's been told that she can't get pregnant, listen carefully. There's a randomized trial called Bambini in women with PCOS or now P MOS. After sleeve gasterectomy patients have roughly two and a half times more spontaneous ovulation events not with medication spontaneous plus improvement in high androgen levels in quality of life and in psychological health. A meta analysis found significant reduction in infertility and in irregular periods with no increase in miscarriage and no increase in birth defects. In one data set, PCOS features drop from 46% down to 7% and infertility from 18% down to 4%. And in men, because this isn't just a woman section, sexual function improves, testosterone goes up, SHBG goes up, estradiol goes down. And although I'll be honest that sperm quality doesn't reliably change. So if that's a specific issue, surgery is not going to fix that for sure. And here's the safety rule that's not optional. Do not get pregnant right away. Wait until your weight loss has stabilized and your vitamin levels are solid. And work with both your beriatric team and your obstatrician. Fat soluble vitamin deficiency during pregnancy carries real risk to a baby. It can cause permanent disability and developmental delays for the baby. This is exactly why we do labs for life. All right, let's talk about results that never make it to the brochure. Rapid fire. Four things that you almost certainly never heard of connected to this operation. Number one, bladder control. Remember my patient? In a study of almost 2,000 patients, urinary incontinence was present in 49% of women and 22% of men before surgery. One year later, it was down to 18 and 10%. And a review of 32 studies found incontinence prevalence dropped by half with improvement in both stress and urge leaking and in prolapse symptoms. Fecal incontinence honestly didn't improve. And here's the detail that matters. The leaking partially came back between year one and year two in patients who regained weight. Everything connects. Two is asthma. 58% of patients achieve clinical remission. 47% stopped their asthma medication completely and lung function measured went up 8.5%. I know that somebody watching this is carrying a rescue inhaler right now. Number three, there's a condition called idiopathic intraranial hypertension which is high blood pressure around the brain and it comes with crushing headaches and it can take your vision. Pulled data shows that the pressure dropped by an average of almost 16 millimeters of mercury with headaches, swelling behind the eye, and vision problems resolving. In a newer analysis, headache improved in 85%, visual fields improved in 83% and 63% stopped their medication. This is an operation that saves eyesight. Number four is psoriasis. In the Swedish study followed as long as 26 years, surgery was associated with a 35% lower incidence of developing psoriasis. And in a Danish study of over 12,000 bypass patients, roughly half the risk of new psoriasis and less than half the risk of it progressing to severe. And an interesting wrinkle is that gastric banding showed no benefit at all, which suggests this is hormonal, not just mechanical weight loss. None, not one of that fits on a scale. So, let's talk about your work and your wallet. Two practical things at work. A review of 42 studies found consistent improvement in productivity in showing up and being present at work and in work capacity. And in English national data of 40,662 patients, there was a sustained increase in the probability of being employed and an average pay increase of about 84 pounds a month at 5 years. An honest caveat, the employment gains tend to follow a curve that rises and then drifts back downwards towards baseline at year five. But which is one more reminder that this is a chronic disease requiring lifelong attention, not a one-time repair. money. Pharmacy costs went down 23% over four years. Diabetes prescriptions down almost 74%. Blood pressure prescriptions down about 48%. Heart medications down about 49%. In a registry data, diabetes medicines fell down about 28% to 10% at 2 years in surgical patients, while in non-surgical patients, they climbed to 54% at 15 years. for patients with diabetes specifically, total health expenditures dropped 28% driven by a 56% drop in medication spending. And an honest counterpoint is across the whole population, including patients without diabetes. These lower medication costs were partially offset by a higher risk of hospitalization. So long-term spending looks similar to controls. Surgery is not free money. For diabetics, though, the economics are dramatic. So, one part that I I swore I would I would not leave out, I promise you the results that nobody talks about, and that includes the ones that aren't good news because if I only give you the highlights, I'm just selling you something. So, let's talk about bone health. Fracture risk goes up after buriatric surgery in the range of 21 to 44% higher in observational data. It tends to start climbing around 3 years out, and it's not equal across the procedures. The risk gradient uh runs the highest with the douadal switch, then the bypass, then the sleeve. There was a randomized trial called Osberg that compared sleeve and bypass head-to-head and bone density at the hip and the spine dropped significantly more after bypass and the markers of bone turnover were about twice as high. And critically, the difference was driven by the procedure itself, not just by how much weight people lost. So what do we do about it? This is not a shrug. You got to fix vitamin D. Get real calcium, get enough protein, and lift weights. Because in a randomized trial, it showed that resistance training reduce the bone density loss at the hip and femoral neck and wrist after gastric bypass. Which brings me back to something I said a while ago. Protein and resistance training protect your muscle and they protect your metabolism. And now you know they also protect your skeleton. Three the same three habits, three different systems. That's not a coincidence and that's why I'm so relentless about it. All right, so let me get back to where I started. I told you the weight loss is the least important thing that happens to you after surgery. And now you know why I said it. The real results are the mammogram that comes back clean. They're the heart attack that never happens. The A1C that stops being a s monthly source of dread, the inhaler that's in a drawer, and the mask that no longer is at the bedside. It's the zoo that you got to walk all the way around, and the grandchild you can play with on the floor. the and the pregnancy that someone told you was impossible. And the last thing is those extra six years. And the real risks are real, too. Alcohol, mood, especially in years two and three, your bones, your relationships. I'd rather you hear it all from me now than discover it alone later. Here's the thing that determines which version of the story is yours. It isn't the procedure. It isn't your willpower. It isn't how much you weigh on day one. It's whether you keep showing up. Every single time we look at long-term data in every domain I covered today, the patients who stay connected to their team do better. Not because they're stronger, but because someone was watching and somebody caught it early. So, if you take one note today, take this one. This operation is not an event. It's the beginning of a relationship. Come to your appointments and stop measuring the most important decision of your life with a bathroom scale. If you're sitting here thinking maybe next year, I want you to remember the six-year curve. The clock doesn't start until you start it. I'll see you in the next video where I'll cover another important metabolic topic. If you have one you'd like me to cover, leave a comment and I'd be happy to. Thanks for watching. Real science, real surgery, real results.

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