San Francisco
Losing weight on a GLP‑1?
Make sure it's fat not muscle.
Ozempic, Wegovy, Zepbound and Mounjaro work. But the scale can't tell fat from muscle, and a meaningful share of fast weight loss can come from lean muscle. A DEXA scan shows you exactly what you're losing so you can protect the muscle and the metabolism that keeps it off.
Clinical-grade DEXA scans, expert results analysis + personalized exercise and nutrition coaching.
The hidden cost
The scale says you’re winning.
Your body composition might disagree.
GLP-1 medications drive rapid weight loss, but rapid weight loss without the right protein and training can strip muscle alongside fat. Lose too much muscle and you slow your metabolism, weaken your body, and set up the rebound that makes the weight come back as fat.
Research on GLP-1 weight loss has found a large share can come from lean muscle, not just fat.
Less muscle means a slower metabolism, which makes regain easier once you stop.
The scale and a tape measure simply cannot see the difference. A DEXA scan can.
Fat loss vs muscle loss
Weight loss is not the same as fat loss.
Two people can lose the exact same number of pounds and end up in completely different places. The difference is how much of it was muscle, and whether anyone was measuring.
Illustrative, based on published ranges for lean-mass loss during rapid weight loss. Your actual split depends on protein intake, resistance training, and dosing. A DEXA scan measures yours precisely.
How it works
Your scan becomes a plan.
A DEXA scan gives you numbers. The analysis is what turns them into a plan to lose fat and keep your muscle.
- 110 min
DEXA scan
The most accurate body composition scan there is. It measures your fat, muscle, bone, and the visceral fat your scale cannot see, region by region.
- 220 min
Expert analysis
A certified analyst shows you exactly how much of what you are losing is fat versus muscle, what matters on a GLP-1, and what to change.
- 3Optional
Your protocol
Walk out with protein and training targets built to protect lean mass. Our coaches can run it with you, or you take it and go.
“I don't think I've felt better. Eating clean, sleeping well, everything's adding up.”
“My LDL finally made a meaningful drop, and achieving that was huge.”
Expert results analysis
What a DEXA scan reveals
A scan gives you numbers; the analysis gives them meaning. Every metric is read in the context of your goals and turned into a plan.
“A DEXA scan is only as valuable as the conversation that follows it. Having an expert walk my patients through their results has fundamentally changed how they engage with their own health. That’s why I always recommend the full Kalos analysis.”
Dr. Chris ThreattMen’s Concierge Health“Kalos has become a trusted extension of how I care for my patients. I know when I refer someone, they’ll be well looked after and given the insight and coaching they need to move forward with confidence.”
Dr. Dominick CuratolaCardiology, MD, FACC- Body Fat %Total and regional fat distribution
- Visceral FatDangerous fat in and around your organs
- Lean TissueMuscle by arms, legs, and trunk
- ImbalancesSide-to-side asymmetries
- ALMIMuscle mass relative to height
- Bone DensityFull skeletal bone map
Meet the team
Your San Francisco team
The certified analysts who walk you through your results and build your plan.
Matteo Ascherio-VictoriaGeneral ManagerMatteo is a semi-professional soccer player, calisthenics athlete and former Data Scientist at Accenture. He holds a Bachelor’s degree in Quantitative Science and Human Health from Emory University. He is NASM-certified in personal training and nutrition coaching and is a 200-hour certified yoga teacher.
Noah FeinbergPerformance analystNoah is a strength and conditioning coach and sport scientist who has worked across the UFC, NHL, and Olympic wrestling. He has trained UFC champions and Olympic medalists, and spent time in human performance research at the Mayo Clinic. He holds an MSc in Strength and Conditioning from Arizona State University.
Morgan MitchellPerformance analystMorgan is a former consultant at KPMG with over a decade in weightlifting and competitive soccer and volleyball. She was named Top Female Trainer at Equinox Sports Club San Francisco in 2023 and 2024. She is a certified personal trainer and nutrition coach with experience prepping clients for Ironman and triathlons.
Max ShakespearePerformance analystMax is a former world champion and competitive rower with 15 years in elite sport, representing Team GB, Harvard and Stanford. He holds a degree in Psychology from Harvard and a Master’s in Community Health and Prevention Research from Stanford, combining behavior change with athletic experience.
Thérèse HarveyPerformance analystThérèse has a decade in fitness coaching. A former Tier 3 Equinox trainer and F45 Head Trainer who coached 300+ members, she specializes in building muscle with an emphasis on biomechanics, and holds certifications including mobility, kettlebell and pain-free strength performance.
Frequently asked questions
Why do GLP-1 medications cause muscle loss?
Any fast weight loss, whether from a medication, surgery, or aggressive dieting, can pull from both fat and muscle. Without enough protein and resistance training to signal your body to keep muscle, a meaningful share of what you lose can be lean mass. A DEXA scan is how you see whether that is happening to you.
When should I get my first scan?
Ideally before you start, or as early as possible, so you have a true baseline. If you are already on a GLP-1, the best time to scan is now, so you can course-correct from here.
Can a DEXA scan tell fat from muscle?
Yes. That is exactly what it measures. It separates fat, lean muscle, and bone, region by region, including visceral fat around your organs. The scale and a tape measure cannot do this.
Do I need to stop my medication?
No. Kalos does not prescribe or manage your medication. We measure your body composition and give you the nutrition and training guidance to lose fat while protecting muscle, alongside whatever your prescriber has you on.
Is the scan safe?
Yes. A DEXA scan uses a very low dose of radiation, far less than a standard X-ray and comparable to a few hours of normal daily background exposure.
Can I use my HSA or FSA?
Yes, our scans are HSA/FSA eligible.