Medical Weight Loss

If you’ve tried to lose weight before, you already know this: weight loss is not just “willpower.” Appetite regulation, stress, sleep, metabolic adaptation, and muscle loss can all get in the way—especially after a few cycles of losing and regaining. You may be considering a GLP-1 inhibitor (like semaglutide or tirzepatide), but you want it done safely, with real medical supervision and a plan that protects your strength.

At Princeton Sports & Family Medicine (PSFM), our medical weight loss program combines clinician oversight, nutrition coaching, strength & conditioning, and resting metabolic rate testing. The goal is sustainable weight loss and better metabolic health—without overpromising and without relying on medication alone.

You can choose an intensive 16-week program or longitudinal membership for ongoing support and maintenance. Medication may be discussed as part of care, but participation is not contingent on taking a GLP-1.

Ready for a structured, supervised approach in Princeton and the surrounding Mercer County area?
Schedule a consultation: https://www.princetonmedicine.com/schedule

What “medical weight loss” means at PSFM

“Medical weight loss” should mean more than a weekly check-in and a prescription. At PSFM, physician-guided weight loss is a coordinated program designed to support:

• Safety and oversight (medical history, monitoring, decision-making support)
• Appetite regulation and behavior change (practical strategies you can repeat)
• Nutrition coaching (protein, calories, and realistic routines)
• Strength training for weight loss (preserve muscle / lean mass)
• Testing to personalize your plan (resting metabolic rate testing)

This integrated approach is built for adults in and around Princeton, Lawrenceville, West Windsor, Plainsboro, Hopewell, Pennington, Robbinsville, Mercer County, and Central New Jersey who want structure, accountability, and a plan that fits real life.

GLP-1 inhibitors: balanced education (and why supervision matters)

A GLP-1 inhibitor (often grouped as GLP inhibitors) is a class of medication used to support weight loss and metabolic health in appropriate patients. These medications can help with:

• Appetite regulation (less “food noise,” fewer cravings)
• Satiety (feeling full sooner and staying full longer)
• Glycemic effects (improved blood sugar patterns for many people)

Common side effects

Many people tolerate GLP-1 inhibitors well, but side effects can occur—especially during dose changes. Common examples include nausea, constipation or diarrhea, reflux, and reduced appetite. Most side effects are manageable with dosing strategy, nutrition adjustments, hydration, and follow-up.

Why supervision matters

Weight loss medication is not “set it and forget it.” Appropriate care includes:

• Monitoring how you feel and how your body responds
• Adjusting nutrition (especially protein) to help preserve muscle / lean mass
• Pairing medication (if used) with strength training and a sustainable plan
• Addressing plateau, regain, metabolic adaptation, and adherence barriers

Important: medication is optional

At PSFM, GLP-1 discussion/prescribing may be part of your care plan, but it is never a requirement. Some patients use medication. Some don’t. Many benefit from medical oversight, nutrition coaching, training, and metabolic testing regardless.

Basal Metabolic Rate vs Resting Metabolic Rate: what they mean (and why calculators can mislead)

You’ll see online tools estimating calories using a number called basal metabolic rate (BMR). It’s a useful concept, but it can be misunderstood.

What is basal metabolic rate (BMR)?

BMR is the energy your body would use in a true baseline state—think “minimal energy required to keep you alive” under very controlled conditions.

What is resting metabolic rate (RMR)?

Resting metabolic rate is a practical, real-world measurement of how many calories your body burns at rest in a typical setting. For many people, RMR is the more useful number to guide a plan—especially if you’ve struggled with plateau, regain, or metabolic adaptation.

Why online calculators miss the mark

Most calculators use population-based equations. They don’t “see” your unique combination of:

• Body composition (muscle vs fat mass)
• Recent dieting history and metabolic adaptation
• Training status and lifestyle
• Age-related changes and sleep/stress effects

That’s why two people of the same height and weight can have very different needs.

The PSFM RMR test: simple, quick, and personalized

Your RMR at PSFM is measured using a 10-minute seated breathing test. You sit comfortably and breathe into a tube. This helps estimate how many calories your body burns at rest—using data from your actual physiology, not an algorithm.

How RMR results guide your plan

RMR testing can help you and your care team personalize:

• A realistic calorie target (not guesswork)
• Protein targets to support lean mass preservation
• Adjustments when you plateau (without extreme restriction)
• A plan that matches your training and lifestyle

Program options

Option 1: 16-week intensive program

This is a structured on-ramp for people who want clear expectations and momentum. Over 16 weeks, you’ll complete a minimum set of medical, nutrition, training, and metabolic testing visits designed to build habits you can keep.

Option 2: Longitudinal membership

Some patients want ongoing support beyond the first phase—especially for maintenance, preventing regain, and navigating life changes. Longitudinal membership is designed as continued follow-up and accountability after the initial structured program.

What’s included (and why each piece matters)

Your initial 16-week program includes an integrated care team and a minimum set of touchpoints. This structure is intentional—it’s meant to support sustainable weight loss and better metabolic health, while protecting strength.

1) Medical visits: minimum 6 (billable to insurance)

Why it matters: Clinician oversight helps ensure safety, personalization, and follow-through. Your visits focus on:

• Your goals, history, and barriers (including plateau or regain)
• A practical plan for appetite regulation and adherence
• Discussion of GLP-1 inhibitors when appropriate (optional)
• Progress review and troubleshooting

2) Dietician visits: minimum 4 (billable to insurance)

Why it matters: Many people “know what to do” but can’t stick to it. Nutrition coaching helps you turn knowledge into routines you can repeat. Visits typically focus on:

• Protein strategy to help preserve muscle / lean mass
• Planning for hunger, cravings, dining out, and travel
• Building a sustainable pattern, not a temporary diet

3) Personal training sessions: minimum 4 (program-covered)

Why it matters: Weight loss without strength can backfire. Training supports:

• Lean mass preservation
• Function and confidence
• Long-term metabolic health and injury prevention

If injury is an obstacle, PT can substitute.
https://www.princetonmedicine.com/contents/services/physical-therapy-services

4) Metabolic testing: minimum 3 resting metabolic rate tests

Why it matters: RMR testing helps personalize your plan and adapt it over time—especially during plateaus or changes in training, appetite, or adherence.

• Test is a 10-minute seated breathing test
• Results guide individualized calorie and protein targets

Example 16-week roadmap

Every person’s plan is individualized, but here’s a straightforward example of how the 16-week structure may look.

Weeks 1–2: Pre-enrollment + goals

• Initial clinician visit to review goals and health context
• Discussion of options (including GLP-1 guidance if desired)
• Planning for routines, barriers, and accountability

Week 3: Metabolic testing + plan personalization

• First resting metabolic rate testing (10-minute seated breathing test)
• Nutrition targets refined based on results (calories, protein)
• Early dietician visit to turn targets into a doable weekly plan

Weeks 3–6: Build the foundation

• First training session focused on safe strength work
• Early follow-ups (medical + nutrition) to reduce friction and improve adherence
• Appetite/craving strategies and routine-building

Weeks 7–12: Progress, plateau-proofing, and adjustments

• Repeat RMR testing as scheduled
• Training progression to support strength and consistency
• Nutrition refinements that fit your schedule (not perfection)

Week 16: Review + next phase planning

• Repeat RMR testing and a closing review
• Evaluate progress, barriers, and what works best for you
• Decide next steps: transition plan or longitudinal membership for maintenance/preventing regain

Who it’s for (and who it may not be for)

This program is a fit for adults who want:

• Sustainable weight loss with structure and accountability
• Better energy and metabolic health
• Physician-guided weight loss and ongoing supervision
• GLP-1 guidance with proper monitoring (optional)
• A plan that prioritizes preserve muscle / lean mass
• Support with plateau, regain, appetite/cravings, or “I can’t stick to it”

Who it may not be for

This program is built for active participation. It may not be the best match if you’re looking for a medication-only approach without nutrition coaching or strength training.

If you have a complex medical history, we’ll help you decide if this program is appropriate and what level of supervision is best. The first step is a consult to review your goals, risks, and options.

Why strength training is non-negotiable

From a sports medicine perspective, strength isn’t cosmetic. It’s foundational health.

When people lose weight—especially with significant calorie reduction or appetite suppression—lean mass can be lost along with fat mass. Losing muscle can make it harder to maintain results and can reduce function over time.

Strength training supports:

• Muscle preservation during weight loss
• Functional capacity for work, family, and life
• Injury prevention and confidence in movement
• A healthier long-term trajectory for metabolism and aging

This is why PSFM integrates strength training for weight loss into the program. You’re not just chasing a number on the scale. You’re building an outcome you can keep.

Cost + insurance clarity

Program fee (16 weeks)

• $1,299 for the initial 16-week program
• Not covered by insurance
• HSA/FSA eligible

What the fee covers

Your program fee covers administration + metabolic testing + personal training.

Medical and dietician visits

• Medical visits (minimum 6): billable to insurance
• Dietician visits (minimum 4): billable to insurance
• Copays still apply for MD/RD/PT visits if billed to insurance

 

How we compare (without the hype)

Many competitors charge $3,000–$10,000 over ~4 months for higher-touch models. Some in-clinic GLP-1 programs run $250–$350/month, and many telehealth models are $300–$600/month. PSFM is designed to be more comprehensive and more affordable than many competitors, with a model that rewards active participation—because building skills and routines is a feature, not a burden.

FAQs

What is medical weight loss?

Medical weight loss is a structured program guided by a clinician to support safe, sustainable weight reduction. It often includes nutrition coaching, behavior support, and strategies to preserve muscle and metabolic health.

What is a GLP-1 inhibitor?

A GLP-1 inhibitor is a medication class that can support weight loss by improving appetite regulation and increasing satiety. It may also improve blood sugar patterns for many patients, depending on their metabolic health.

Do I have to take a GLP-1?

No. At PSFM, medication may be discussed as part of care, but participation is not contingent on taking a GLP-1. Many patients benefit from clinician oversight, nutrition coaching, strength training, and metabolic testing with or without medication.

What is basal metabolic rate?

Basal metabolic rate (BMR) is the amount of energy your body needs to maintain basic functions under very controlled conditions. It’s a helpful concept, but it’s often estimated with formulas that don’t reflect individual variability.

How is resting metabolic rate tested?

At PSFM, resting metabolic rate testing is a 10-minute seated breathing test. You sit comfortably and breathe into a tube, and the results help estimate how many calories your body burns at rest.

How do I avoid muscle loss on GLP-1?

Muscle preservation usually requires a deliberate plan: adequate protein, progressive strength training, and appropriate calories for your physiology. That’s one reason PSFM integrates nutrition coaching, training, and metabolic testing into medical weight loss.

How long should I stay in a weight loss program?

Many people benefit from an initial structured phase (like 16 weeks) to build routines and momentum. Ongoing support can be helpful for maintenance, preventing regain, and navigating life changes—this is where longitudinal membership may fit.

Is this covered by insurance?

The $1,299 program fee is not covered by insurance (HSA/FSA eligible). Medical and dietician visits are billable to insurance, and copays may still apply when those visits are billed.

What if I have a plateau or regain?

Plateaus and regain are common and often related to metabolic adaptation, routine fatigue, and shifting life demands. Your care team can adjust nutrition and training targets and use repeat RMR testing to make the plan more personalized and realistic.

Is this a good fit if I’m dealing with injuries?

It can be. The program includes personal training, and PT can substitute if injury is an obstacle. Your clinician and team can help you choose a safe way to build strength and protect function.

Take the next step

If you’re looking for a medical weight loss program in Princeton, NJ that combines clinician oversight, nutrition coaching, strength training, and resting metabolic rate testing—with optional GLP-1 inhibitor guidance—PSFM can help you build a plan you can sustain.

Schedule a consultation: https://www.princetonmedicine.com/schedule
Call: (609) 896-9190
Questions?: https://www.princetonmedicine.com/contactus

Medical disclaimer

This page is for education and general information only. It does not provide medical advice, diagnosis, or treatment. If you have urgent symptoms or a medical emergency, seek emergency care or call 911. Recommendations for weight loss, nutrition, exercise, and medication are individualized and should be discussed with your clinician.