Weight Loss
You've tried everything. The weight won't budge. When diet and exercise aren't working, the answer often lies in your metabolism, hormones, or inflammation.
Weight loss, as an area of medicine, is about why body weight resists reasonable effort and what is actually regulating it: insulin and blood sugar, thyroid function, cortisol, the sex hormones, sleep, medications, the gut, and how much muscle a person carries. The people who arrive here have usually done a great deal already. They have counted calories, cut carbohydrates, added cardio, tried fasting windows, and watched the scale hold or climb anyway. They have been told to eat less and move more, that it comes down to discipline, or that this is simply what happens after a certain age, and their standard labs have come back within range. Many are also weighing whether one of the newer weight-loss medications makes sense for them, and what would need to be true for it to be used well.
A thorough workup in this area treats resistant weight as a signal to investigate rather than a behavior to correct. It begins with the pattern: where the weight has settled, whether it arrived with fatigue, cravings, sleep changes or a shift in the menstrual cycle, and which medications and life events preceded it. The labs go beyond glucose and cholesterol to fasting insulin, the longer-term average of blood sugar, triglycerides read against HDL, a full thyroid panel, a cortisol pattern, sex hormones, liver enzymes and inflammation markers, plus a body composition measurement that separates muscle from fat instead of relying on the scale. The physician reads those results as one picture, decides which driver to address first, and builds a plan that protects muscle while the weight comes down, whether or not medication is part of it.
Quick answers
When reasonable effort is not moving the scale, something in the body's regulation is usually biasing it toward storage. The most common drivers are insulin resistance, in which cells respond less well to insulin and the body stores more of what comes in; an underactive thyroid; a cortisol rhythm distorted by sustained stress or short sleep; the hormonal shifts of perimenopause; and medications that promote weight gain as a side effect. Each of these can be identified with the right tests, and each calls for a different first step, which is why the same diet produces such different results in different people.
The useful additions to a standard panel are fasting insulin alongside fasting glucose, a longer-term blood sugar average, triglycerides read against HDL, a full thyroid panel including the active hormone and antibodies, a cortisol pattern measured across the day, sex hormones timed to the cycle, and markers of inflammation and liver fat. A body composition scan adds what no blood test can: how much of the weight is muscle, how much is fat, and where the fat sits. What matters more than any single value is how the results fit together and how they compare with earlier ones.
Yes. Insulin resistance develops years before fasting glucose changes, because the pancreas compensates by making more insulin, so glucose stays in range while insulin climbs. Fasting insulin, sometimes combined with glucose in a simple calculation, catches this stage, and the pattern of high triglycerides with low HDL, weight settling at the waist, skin tags and afternoon crashes points the same way. It is also among the more responsive conditions in medicine when it is found this early.
Resistant weight sits where endocrinology, metabolic medicine and nutrition meet, so the physician best placed to investigate it is a generalist who is comfortable across those areas, usually an internal medicine or family physician, with an endocrinologist when a specific gland is the question. A dietitian, a trainer or a health coach often carries the day-to-day work of the plan; the physician's role is to work out what is driving the resistance, to treat the conditions that need treating in their own right, and to coordinate everyone involved. Weight-loss medications, where they are appropriate, belong inside that plan rather than in place of it.
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Each guide is a full page on a single pattern: what is happening, what else it can be, and what a workup looks at.
About the Author
Board-certified internal medicine physician and founder of Extend Medical. She founded Extend Medical to practice the kind of medicine she believes patients deserve: thorough, personalized, and built on deep investigation rather than quick fixes.
Learn more about Dr. Paul→If you're tired of being told "everything looks normal" when it doesn't feel normal, start with an inquiry. I review every one personally.
