Am I a Candidate for Bariatric Surgery?

The Standard Candidacy Criteria

Bariatric surgery is a recognized medical treatment for obesity, not a cosmetic shortcut, and the criteria for who qualifies are based on decades of clinical evidence. The most widely used guideline looks at your body mass index (BMI) together with any health conditions that obesity has caused or worsened.

In general terms, you may be a candidate if your BMI is 40 or higher, which corresponds to roughly 100 pounds or more above a healthy weight. You may also qualify with a BMI of 35 or higher when you also live with at least one obesity-related condition such as type-2 diabetes, high blood pressure, obstructive sleep apnea, severe joint disease or fatty liver disease. In these cases surgery is often recommended precisely because it can improve or even resolve those conditions, not only reduce weight.

More recently, some metabolic and bariatric programs consider patients with a BMI of 30 or higher when a serious condition like poorly controlled type-2 diabetes is present, because the metabolic benefits can be significant. Whether this applies to you is a decision a qualified surgeon makes after a full evaluation. If you are exploring your options, our overview of bariatric surgery in Colombia explains the procedures available and how the process works for international patients.

How to Calculate Your BMI

Because BMI is the starting point of the conversation, it helps to know roughly where you stand before your assessment. BMI is a simple ratio of weight to height. The metric formula is your weight in kilograms divided by your height in meters squared. If you think in pounds and inches, multiply your weight in pounds by 703, then divide by your height in inches squared.

As an example, someone who is 5 feet 6 inches tall (66 inches) and weighs 250 pounds has a BMI of about 40. The same person at 220 pounds would be near 35. These numbers place many people squarely within the candidacy range, which is why an honest measurement is a useful first step.

That said, BMI is only a screening tool. It does not measure muscle, fat distribution or overall health, so a surgeon never relies on it alone. Two people with the same BMI can have very different risk profiles. Your evaluation looks at the whole picture, and BMI simply opens the door to that deeper conversation. You do not need to calculate anything perfectly on your own; the bariatric team confirms your measurements during the assessment.

The Pre-Operative Medical and Psychological Evaluation

Qualifying for bariatric surgery is never based on weight alone. Every reputable program requires a thorough pre-operative evaluation, and this protects you. The goal is to confirm that surgery is the right tool for your situation and that you can undergo it safely.

The medical portion typically includes blood work, an assessment of your heart and lungs, screening for conditions such as diabetes, thyroid disorders, vitamin deficiencies and sleep apnea, and a review of every medication you take. A nutritionist evaluates your eating patterns and begins teaching you the dietary changes that surgery will require. Your surgeon and a board-certified anesthesiologist review all of this to plan the safest possible procedure.

The psychological evaluation is equally important and is a standard, routine part of the process rather than a judgment of your character. A mental-health professional helps confirm that you understand the lifelong changes ahead, that any conditions such as untreated depression or disordered eating are being addressed, and that you have realistic expectations and adequate support at home. Surgery succeeds when the mind and body are both prepared. HealthBridge coordinates this complete workup with the surgical team so nothing is overlooked; you can read more about how we work on the HealthBridge home page.

Conditions That Must Be Optimized First

Sometimes the evaluation reveals issues that need attention before surgery can go ahead. This is not a rejection. It is responsible medicine, and most of these conditions can be managed so that you become a strong candidate.

Blood sugar in poorly controlled diabetes is often stabilized before the operation to lower surgical risk and improve healing. High blood pressure and heart conditions are reviewed and optimized with the appropriate specialists. Untreated obstructive sleep apnea may need to be addressed because it affects anesthesia safety. Nutritional deficiencies, thyroid problems and certain infections are corrected first as well.

Smoking deserves special mention. Nicotine restricts blood flow and significantly raises the risk of complications and poor healing, so surgeons typically require patients to stop smoking for several weeks before and after surgery. Likewise, if the evaluation identifies active substance misuse or an unmanaged eating disorder, treating that comes first for your own safety and long-term success. Once these factors are optimized, the door to surgery usually opens. The team will tell you honestly what, if anything, needs to happen before you can proceed.

The Lifelong Commitment Surgery Requires

Perhaps the most important thing to understand is that bariatric surgery is a powerful tool, not a cure that works on its own. The operation reduces the size of your stomach and changes how your body handles food, but the lasting results depend on the changes you make and maintain for the rest of your life.

After surgery you will follow a carefully staged diet, beginning with liquids and progressing gradually to small, protein-focused meals. You will eat much smaller portions and learn to listen to new signals of fullness. Daily vitamin and mineral supplements become a permanent habit, because the smaller stomach and altered digestion mean your body absorbs fewer nutrients; skipping them can lead to serious deficiencies over time. Regular blood tests and follow-up visits, at first frequent and then annual, keep everything on track.

Physical activity, hydration and ongoing support also matter. Patients who embrace these changes often experience dramatic, durable weight loss and major improvements in conditions like diabetes and sleep apnea. Those who view surgery as a one-time fix are more likely to regain weight. Being honest with yourself about this commitment is part of being a good candidate. If you are weighing your choices, our guides comparing sleeve vs bypass and the gastric sleeve cost can help you understand what each path involves.

Who Is Not a Candidate, Age, and Your Free Assessment

Just as important as knowing who qualifies is understanding who may not, at least not yet. Bariatric surgery is generally not recommended for someone whose BMI falls below the accepted thresholds without related health conditions, for someone unwilling or unable to commit to the lifelong follow-up and supplements, or for someone with an untreated condition that makes surgery unsafe. Active, unmanaged substance misuse, certain unstable psychiatric conditions and some serious medical illnesses are reasons a surgeon may advise waiting or choosing another path. None of this is a personal judgment; it is about timing and safety, and many people who are told "not now" become candidates later once a condition is treated.

Age is considered individually rather than as a strict cutoff. Most programs focus on adults, and many older adults in good health are excellent candidates because the benefits to conditions like diabetes and mobility can be life-changing. What matters more than the number on your birth certificate is your overall health, your surgical risk and your readiness for the lifestyle changes. A careful surgeon weighs all of these factors together.

The honest truth is that you cannot know for certain whether you qualify until a board-certified bariatric team evaluates you. That is exactly why HealthBridge offers a free, no-pressure assessment. We are a facilitator, not a clinic: we connect you with vetted, board-certified surgeons in accredited Medellin clinics, coordinate your evaluation, and guide you through every question in plain language. Dra. Olga Gonzalez, our medical director and coordinator, oversees the process so you feel informed and supported from your first message. Whether the answer is yes today, or not until a condition is optimized, you will leave the assessment knowing exactly where you stand and what your options are.