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Discover our productsOn a GLP-1, the number on the scale goes down. But it can't tell you what you're losing. Up to 40% of the weight lost on these medications can be muscle. A Withings body composition scale separates fat from muscle. It also tracks visceral fat and hydration. Every weigh-in becomes a trend you can share with your doctor. Start before your treatment begins. Every later reading is compared to that first one.
The powerful checkup for reaching your goals.
Full-body mapping. Ultimate precision.
The scale, reinvented for longevity.
Because weight is one number that covers four tissues: fat, muscle, bone and water. On a GLP-1, they don't move together. A standard scale shows the total going down. It can't show that part of the loss is muscle. It can't show that a flat week is fat leaving while muscle holds.
A body composition scale breaks that number apart. It also reads visceral fat, the fat around your organs. So you can see whether the loss is the kind you want. Across 1,000,000+ Withings members, people who watch what they're losing appear to lose less of what they want to keep.¹
Five readings matter on a GLP-1. A standard bathroom scale gives you none of them.
¹Withings member data, 2026. Withings members own a connected scale and are not a representative sample of people on GLP-1 treatment. Journey timing is indicative.
| What the scale reads | The question it answers | When it matters most¹ |
|---|---|---|
| Muscle mass | Am I losing the tissue that helps keep weight off? | Months 4 to 8, when muscle starts to go |
| Fat mass | Is the loss actually fat? | The whole journey |
| Visceral fat | Is my metabolic health improving, not just my shape? | The whole journey |
| Hydration | Am I drinking enough? GLP-1 treatments can affect hydration. | Months 0 to 4, while your dose is being adjusted |
| Basal metabolic rate | Is my body burning less as I lose weight? | Months 4 to 8, as weight loss slows |
Segmental models (BodyFit, Body Scan, BodyScan 2) show fat and muscle by body zone: arms, legs and trunk. So you can see where muscle is changing, not just whether it is.
By seeing it early. Muscle is harder to rebuild than fat is to lose. Two habits help: strength training a few times a week, and protein spread across your meals. Ask your doctor or a dietitian what suits you. But you can't act on what you can't see.
Muscle loss is the #1 concern of Withings users on GLP-1: 53% name it as a worry.* A body composition scale turns that worry into a trend. If your muscle mass is dropping while your weight falls, that's the signal to raise it with your doctor.
If you only track total weight, you might be celebrating muscle loss. Clinical data suggests that without monitoring, a significant portion of that weight loss can come from lean tissue. Withings scales use BIA (Bioelectrical Impedance Analysis) to estimate your muscle mass at every weigh-in. Read it as a trend over weeks, not as a single number.
A regular scale gives you one number: your total weight. A Withings body composition scale uses bioelectrical impedance to split that weight into fat mass, muscle mass, bone mass, body water and visceral fat. Segmental models go further and map fat and muscle by body zone.
On a GLP-1, that difference is the whole point. The total can fall while muscle quietly goes with it. Only the breakdown shows you which is happening.
Withings scales are built for trends, not one-off readings. What matters is the line over weeks, not this morning's number.
The scale takes the readings. The free Withings app turns them into decisions.
Share with your doctor: Generate a report of your weight and body composition trends in seconds. Bring it to your check-up: two-thirds of Withings users on GLP-1 already share their data with their doctor.* A doctor reading fat and muscle over time sees far more than a single weight.
See the trend, not the noise: The app focuses on the line over weeks. Daily ups and downs can make you doubt a treatment that is still working.
Follow your metabolic rate: Your basal metabolic rate is calculated from your own body composition and tracked like any other reading.
Measure without the number: Some mornings the number isn't what you need. Eyes-Closed Mode records the reading to the app while the display stays blank.²
Stay motivated: 74% of Withings users on GLP-1 say tracking increased their motivation.*
Seamless integration: Syncs with Apple Health, Google Fit and many other health apps.
Disclaimer:
GLP-1 receptor agonists are prescription medications used for the treatment of type 2 diabetes or obesity. Withings devices are for health tracking and wellness purposes only and do not treat or diagnose any medical condition. Always follow your physician's advice regarding your treatment plan and diet.
*Withings user survey, July 2026, n = 1,620. Figures refer to Withings users on GLP-1 and are self-reported.
**Withings internal device data, 2026
¹Withings member data, 2026. Withings members own a connected scale and are not a representative sample of people on GLP-1 treatment. Journey timing is indicative.
²Available on compatible models.
Under GLP-1, the scale that helps most is a body-composition scale that tracks fat, muscle, visceral fat and hydration. Among Withings scales: Body Smart is the entry point for fat and muscle; BodyFit adds segmental mapping (fat and muscle by arm, leg and trunk); BodyScan 2 gives the most complete picture for long-term tracking. All three separate fat from muscle. They all read visceral fat, hydration and basal metabolic rate. What changes is how detailed the picture gets.
Body Smart gives you fat, muscle, visceral fat, hydration and metabolic rate at the most accessible price. BodyFit adds segmental readings, so you can see where muscle is changing. BodyScan 2 offers the most complete picture, with segmental readings and Body Profile, for those tracking their health beyond the GLP-1.
The best scale for GLP-1 weight loss is a body-composition scale that separates fat, muscle, visceral fat and hydration — not just total weight. Among Withings scales, Body Smart covers fat and muscle, while BodyFit and BodyScan 2 add segmental readings that show which body zones are losing muscle.
BodyFit and BodyScan 2 — both add segmental readings that show fat and muscle by body zone, so you can see where muscle is being lost.
You need a body composition scale, not a standard one. A standard scale only shows total weight, so it can't tell fat loss from muscle loss. A body composition scale shows both, so you and your doctor can see what kind of weight you're losing.
It can show a drop in your muscle mass trend. Withings scales use bioelectrical impedance to estimate muscle mass at each weigh-in. Read the trend over weeks: if it falls while your weight falls, raise it with your doctor.
Withings body composition smart scales are built to track trends, not to replace a clinical exam. Withings scales measure the same way each morning, so changes over weeks are meaningful. Focus on the direction of the line, not a single reading. Learn more about scale accuracy.
Yes. The Withings app generates a report of your weight and body composition trends that you can bring or send to your doctor. A trend over weeks tells a clinician far more than a single weight.
Yes. All the Withings scales read visceral fat, body water and basal metabolic rate alongside fat and muscle mass. Segmental models add fat and muscle by body zone.
Yes, this is when body composition matters most. A flat weight can hide fat leaving while muscle holds. Among Withings users on GLP-1 facing a plateau, 47% say their data made them more likely to stay on treatment, versus 3% to quit.* If the stall lasts more than a few weeks, talk to your doctor.
A body composition scale and the app that goes with it. At home, a Withings scale tracks weight, fat, muscle, visceral fat, hydration and basal metabolic rate at each weigh-in, and the Withings app turns them into trends you can share with your doctor. No clinic visit is needed between check-ups.
