Skip to content
GLP-1 Calculators

Body Recomposition on GLP-1 2026 — Lose Fat, Keep Muscle, Gain Strength

Preserve lean mass and build strength while losing 15–25% of body weight. Protein, training, and body-composition math anchored to trial sub-study data.

Updated April 2026

Medical disclaimer: This tool is for informational purposes. Not medical advice. Consult your healthcare provider before starting, stopping, or changing any medication. Drug prices, savings cards, and coverage policies change frequently — verify current pricing directly with the manufacturer or your pharmacy.

Your inputs

Results

Projected body fat %
23.0%
Fat lost: 12.8 lb / Muscle gained: 0.8 lb
End weight
188 lb
Muscle gained
0.8 lb
True recomp on GLP-1 requires high protein (2g/kg lean mass) plus 3+ resistance sessions weekly. Fat loss is easy on GLP-1; muscle gain is the hard part and requires deliberate effort.

Why recomp is harder on GLP-1 than off it

GLP-1 drugs suppress appetite so effectively that most patients unconsciously drop protein intake by 20–40% during the steep loss phase. Protein is the single biggest driver of lean-mass preservation during weight loss. When protein drops and weight loss accelerates, lean-mass loss accelerates too. The solution is deliberate — you have to plan protein intake rather than eating to appetite.

The second headwind is training intensity. GLP-1s cause fatigue in a meaningful subset of patients, especially during titration. Missed sessions compound into lost training stimulus, and without stimulus muscle protein synthesis falls. Plan sessions you’ll realistically complete rather than ambitious ones you’ll skip.

A simple muscle-preservation protocol

  1. Protein: 1.2–1.6 g per kg of goal body weight, daily. Split across 3–4 meals, each 25–40 g protein.
  2. Resistance training: 2–3 full-body sessions per week, 4–6 compound lifts per session, progressive overload.
  3. Creatine: 3–5 g daily, taken any time.
  4. Sleep: 7+ hours. Sleep restriction accelerates lean-mass loss during deficit.
  5. Cardio: zone 2 walks 3–5× per week for cardiovascular and metabolic health. Don’t over-cardio.

Protein sources that work around GLP-1 appetite

  • Greek yogurt (15–20 g per cup, easy to eat when appetite is low).
  • Protein powder in smoothies or water (25–30 g per scoop, frictionless).
  • Cottage cheese (25 g per cup).
  • Chicken breast, fish, lean beef (25–30 g per 4 oz).
  • Eggs and egg whites (14 g per 2 eggs + 2 whites).
  • Tofu, tempeh, and seitan for plant-based eaters.

Measuring progress beyond the scale

  • Waist circumference at the navel (monthly).
  • DEXA or InBody scan every 3–6 months if you have access.
  • Gym strength log — if squat/deadlift/bench are maintaining or climbing, recomp is working.
  • Photos in the same lighting every 4 weeks.
  • Resting heart rate trend (typically drops with recomp).
Related tools
Protein target
Personalized g/kg calculator.
Muscle loss risk
Estimate your lean-mass risk.
Exercise plan
Structured resistance and cardio.
Macro targets
Protein/fat/carb split.
Goal weight timeline
Weeks to target by drug.
Diet on GLP-1
Calorie target and food choices.

Frequently asked questions

Is body recomposition actually possible on a GLP-1?

Yes, but with caveats. STEP 1 DEXA sub-studies showed semaglutide patients lost ~40% of total weight as lean mass and 60% as fat when not controlling for protein and training — roughly the ratio seen in non-pharmacologic weight loss. With structured resistance training and 1.2–1.6 g/kg protein intake, that ratio typically shifts to 15–25% lean / 75–85% fat, which is effectively what the body-composition literature calls 'preservation' — some recomp is possible, but true gain in lean mass while in meaningful deficit is rare.

How much protein do I actually need?

The obesity-medicine consensus is 1.2–1.6 g of protein per kg of goal body weight per day during active loss. For a 180-lb goal (82 kg), that's 100–130 g daily. GLP-1 appetite suppression makes hitting this target genuinely hard — it's the single most important intervention for preserving lean mass.

How much resistance training?

Minimum effective dose is 2 full-body sessions per week of 30–45 minutes with progressive overload. Three sessions is better if you can recover. What matters is load, not reps — you want each working set hard enough that you could do maybe 2–3 more reps at failure. Don't let appetite suppression pull you away from the gym.

Will my strength drop during weight loss?

Usually not, if you train consistently. A ~1% body-weight-per-week loss is slow enough that recovery keeps pace with training stimulus. Strength often holds or slowly increases because you're losing mostly fat tissue that wasn't contributing to force production. Strength drops sharply if you skip resistance training or under-eat protein.

Creatine on a GLP-1 — worth it?

Yes, almost always. Creatine monohydrate at 3–5 g/day has decades of evidence for lean-mass preservation and strength performance; no known interactions with GLP-1s. The one caveat: creatine causes minor water-weight retention (1–3 lb intramuscular water), which can confuse the scale during loss. Track trend weight, not daily.

Should I track body fat % with DEXA or bioimpedance?

DEXA every 3–6 months is gold-standard; one scan runs $50–$150 cash. Consumer bioimpedance scales are noisy on individual readings but useful for trend data if you weigh the same way every time. Waist circumference is a free and surprisingly good proxy — measure monthly at the navel.

What about sarcopenia risk in older patients?

Patients over 60 are more vulnerable to sarcopenic weight loss on GLP-1s. Guidelines for this group often push protein higher (1.5–2.0 g/kg goal weight) and emphasize resistance training non-negotiably. Coordinate with your prescriber if you're in this group — a slightly slower titration and a more structured muscle-preservation plan pays off.

Can I add cardio or does it accelerate muscle loss?

Moderate cardio (2–3 sessions/week, 20–40 min zone 2) is fine and improves health outcomes. Excess cardio while under-eating protein is a recipe for lean-mass loss. If you love cardio, load up on protein and resistance training to offset; if you don't, don't force it — walking daily is enough cardiovascular benefit.

Digital Dashboard Hub

Track your GLP-1 progress, weight loss, and health metrics

DDH has 54 health and wellness trackers — weight loss logs, BMI history, symptom tracking, and habit tools — built for your GLP-1 journey. Free 14-day trial.

Track your GLP-1 journey free →
Part of the Digital Dashboard Hub network
Powered byDigital Dashboard Hub— 250+ free tools

Calculators, trackers, and planners for creators, business, and wellness — all in one place.

Explore all 250+ tools →