What BMI actually tells you
Body Mass Index is a screening tool — a simple ratio of weight to height. It doesn't measure body fat percentage, doesn't account for muscle mass, and doesn't capture where your weight is distributed. What it does do is give clinicians and weight-loss programs a quick, standardized number to compare you against research populations.
Most U.S. clinicians use these categories:
- Under 18.5 — underweight
- 18.5 to 24.9 — normal weight
- 25 to 29.9 — overweight
- 30 to 34.9 — obese, Class I
- 35 to 39.9 — obese, Class II
- 40+ — obese, Class III
Why BMI matters for telehealth weight programs
Most legitimate GLP-1 telehealth programs require a BMI of 27 or higher with a weight-related comorbidity (high blood pressure, type 2 diabetes, sleep apnea, etc.) or a BMI of 30 or higher without one. This isn't arbitrary — it matches the FDA labeling for branded GLP-1 medications and the prescribing guidance most clinicians use.
If your BMI is below 27 and you don't have a comorbidity, most programs won't approve you for GLP-1 medication. That's not a value judgment — it's a safety threshold.
BMI's limitations (worth knowing)
BMI is most misleading for two groups: muscular athletes (whose BMI can land in the "overweight" range despite low body fat) and older adults (whose BMI may understate body fat as muscle mass declines). For these cases, body composition testing — DEXA, BodPod, or BIA — gives a clearer picture than BMI alone.
For most adults, though, BMI is a reasonable starting point. If your number is in the elevated range and your weight has been creeping up, that's a signal worth taking seriously — not because BMI itself is magical, but because it correlates with metabolic risk in most populations.
What to do next
If you're at or above 27, you're a candidate for the major telehealth weight programs. We compared them in our best GLP-1 programs roundup. If you're below 27 and want to focus on metabolic health, at-home labs are a better starting point than weight medication — bloodwork shows whether anything underlying needs attention.