Your primary care doctor is the best starting point for medically supported weight loss, but depending on your situation, you may end up working with an obesity medicine specialist, an endocrinologist, a bariatric surgeon, or a combination of providers. The right doctor depends on how much weight you need to lose, whether you have underlying health conditions, and whether you’ve already tried other approaches without success.
Start With Your Primary Care Doctor
For most people, a primary care physician is the first and sometimes only doctor needed. At a weight-focused visit, your doctor will check your height, weight, BMI, and blood pressure, review your medical history and past weight loss efforts, and likely order blood work to screen for conditions that complicate weight management: diabetes, high blood pressure, heart disease, thyroid problems, and high cholesterol. If your BMI is 25 or above, many electronic medical record systems now flag that automatically, prompting your doctor to discuss weight management options.
Primary care doctors can prescribe weight loss medications, create initial diet and exercise plans, and refer you to specialists when needed. They’re also the ones who typically provide the referral your insurance requires before you can see a specialist. If your weight concerns are relatively straightforward and you don’t have complex hormonal or metabolic issues, your primary care doctor may manage your care from start to finish.
Obesity Medicine Specialists
Obesity medicine is a dedicated medical specialty with its own board certification through the American Board of Obesity Medicine (ABOM). To earn this certification, a physician must already hold board certification in another specialty (like internal medicine or family medicine), complete at least 60 hours of obesity-specific continuing education within three years, and pass a certification exam. This makes ABOM-certified doctors uniquely trained to treat obesity as a chronic disease rather than simply advising patients to eat less.
These specialists typically work in dedicated weight management clinics and take a comprehensive approach. They’re experienced with all FDA-approved weight loss medications, understand the metabolic changes that make weight regain so common, and often coordinate care across a team of dietitians, psychologists, and exercise physiologists. If you’ve struggled with weight for years despite genuine effort, or if your primary care doctor seems unsure how to help beyond basic advice, an obesity medicine specialist is worth seeking out. You can search for one by zip code through the Obesity Medicine Association’s directory.
Endocrinologists
An endocrinologist specializes in hormones and metabolism. You’d see one if your doctor suspects a hormonal condition is driving your weight gain or making it resistant to standard treatment. The most common reasons for referral include hypothyroidism (an underactive thyroid that slows metabolism), Cushing’s syndrome (abnormally high cortisol levels), polycystic ovary syndrome (PCOS), and insulin resistance that’s progressing toward type 2 diabetes.
Not everyone who struggles with weight needs an endocrinologist. But if you’re gaining weight without a clear explanation, experiencing fatigue or other symptoms alongside weight changes, or your blood work shows hormonal red flags, this is the specialist who can dig deeper. Once a hormonal issue is identified and treated, weight loss often becomes more achievable through standard approaches.
Bariatric Surgeons
Bariatric surgery is recommended for people with a BMI of 35 or higher, regardless of whether they have other health problems. For people with a BMI between 30 and 34.9, surgery may be appropriate if they also have a metabolic condition like type 2 diabetes or severe sleep apnea. For Asian patients, these thresholds are lower: a BMI of 27.5 or above qualifies for surgical consideration, reflecting differences in how body fat affects health across populations.
A bariatric surgeon consultation doesn’t commit you to anything. At your first visit, the surgical team reviews your medical history, past weight loss attempts, and daily habits. They check your vitals and may order additional lab work. Most programs also require a psychological evaluation and several months of supervised weight management before surgery is approved. The process is deliberately thorough because surgery works best when patients are prepared for the lifestyle changes that follow.
Psychologists and Behavioral Health Providers
Weight management has a significant psychological dimension, and many people benefit from working with a psychologist or therapist alongside their medical team. About 45% of people seeking bariatric surgery have symptoms of depression, and there’s a well-documented two-way relationship between depression and obesity: people with obesity have a 55% increased risk of depression, while people with depression have a 58% increased risk of developing obesity.
Beyond depression, a behavioral health provider can help with emotional eating, binge-eating disorder (which affects 5 to 15% of bariatric surgery candidates), social anxiety around food and body image, and the stress that often derails weight loss efforts. The most effective approaches include cognitive behavioral therapy (CBT), which helps identify and change the thought patterns driving unhelpful eating behaviors, and motivational interviewing, which helps you clarify your own reasons for change and build commitment to your goals. These aren’t just “talk it out” sessions. They’re structured, evidence-based treatments that address the reasons standard diets fail.
Registered Dietitians
A registered dietitian isn’t a doctor, but they fill a role no other provider is specifically trained to fill: delivering medical nutrition therapy. This means creating an individualized eating plan based on your health conditions, medications, metabolism, and food preferences. While your doctor can prescribe a weight loss medication or identify a thyroid problem, a dietitian translates that into a practical daily eating strategy you can actually follow.
Dietitians also recognize when nutrition therapy alone isn’t enough and additional medical treatment is warranted, making them a valuable link between your daily habits and your medical care. Most weight management clinics include a dietitian as part of the core team, and many insurance plans cover dietitian visits, especially when tied to a diagnosis like obesity or diabetes.
Weight Loss Medications and Who Prescribes Them
The FDA has approved six medications for long-term weight management. The newer injectable options, semaglutide (Wegovy) and tirzepatide (Zepbound), work by mimicking gut hormones that regulate appetite and are given as weekly injections. An older injectable, liraglutide (Saxenda), works similarly but requires daily injections. Three oral options also exist: orlistat, which blocks fat absorption in your gut; a combination of phentermine and topiramate, which reduces appetite; and a combination of naltrexone and bupropion, which targets cravings.
These medications are generally prescribed for adults with a BMI of 30 or higher, or a BMI of 27 or higher with at least one weight-related health problem like high blood pressure or type 2 diabetes. Four of these medications are also approved for children ages 12 and older. Any licensed physician can prescribe them, including your primary care doctor, though obesity medicine specialists tend to have the most experience managing side effects and adjusting doses over time. Insurance coverage for these medications varies widely by plan.
Weight Management for Children
Pediatricians screen for overweight and obesity in children starting at age 2, using BMI percentiles rather than the fixed BMI cutoffs used for adults. The American Academy of Pediatrics recommends annual screening for all children ages 2 through 18 and evaluation for obesity-related health problems when a child’s BMI is elevated. The first-line treatment is intensive, family-centered behavioral and lifestyle programs, not medication or surgery.
If your child’s pediatrician identifies a weight concern, the next step is typically a referral to a pediatric weight management program. These programs involve the whole family and focus on building sustainable habits around nutrition, activity, sleep, and screen time. For adolescents with more severe obesity, pediatric endocrinologists or obesity medicine specialists may become involved, and some of the newer weight loss medications are now approved for teens 12 and older.
Insurance and Getting a Referral
Most insurance plans cover visits to weight management specialists, but many require a referral from your primary care doctor first. Medications may also be covered depending on your specific plan, though coverage for newer injectable medications remains inconsistent. Some components of weight management programs, like meal replacement plans, are often not covered and become out-of-pocket costs. Before scheduling a specialist appointment, call your insurance to confirm whether you need a referral and what services are included under your plan.