GLP-1 Calorie Calculator
Calculate minimum safe calorie floors and elevated daily protein targets for GLP-1 weight loss medications like Ozempic, Wegovy, Mounjaro, and Zepbound.
Your Biological Profile
Based on 1.2–1.5g per lb of lean mass
~110 lb lean muscle & bone mass
Protect Your Muscle While Losing Weight
Splitting your 149g daily protein target across meals maximizes muscle protein synthesis.
Methodology & Medical Consensus on GLP-1 Weight Loss
GLP-1 receptor agonists (such as semaglutide and tirzepatide) work primarily by mimicking natural incretin hormones that slow gastric emptying and target appetite centers in the hypothalamus. While highly effective for weight reduction, this profound appetite suppression can cause patients to unintentionally consume fewer calories than their body requires for essential physiological functions.
Why Calorie Floors Matter (1,200 / 1,500 kcal)
When caloric intake drops below basal survival needs, the body initiates adaptive thermogenesis and accelerates gluconeogenesis—breaking down functional muscle tissue to supply glucose to the brain. To mitigate severe lean mass loss and electrolyte imbalances, clinical consensus recommends strict calorie safety floors of 1,200 kcal/day for women and 1,500 kcal/day for men during pharmacological intervention.
Boer Lean Body Mass & Elevated Protein Defense
To defend lean body mass (LBM) while in a caloric deficit, protein requirements must increase relative to total energy intake. We utilize the validated Boer formula to estimate your baseline lean muscle and bone mass based on height, weight, and biological sex. We then apply an elevated therapeutic protein multiplier of 1.2g to 1.5g per pound of LBM to maximize nitrogen retention and preserve metabolic rate.
Frequently Asked Questions
Why is establishing a strict daily calorie floor mandatory while taking GLP-1 medications?
GLP-1 receptor agonists (such as semaglutide in Ozempic/Wegovy and tirzepatide in Mounjaro/Zepbound) drastically delay gastric emptying and suppress hypothalamic hunger signals. Without a structured caloric floor, patients frequently slide into severe sub-clinical malnutrition (<1,000 kcal/day), triggering rapid muscle catabolism, hair loss (telogen effluvium), and metabolic down-regulation.
What is the minimum safe daily caloric intake during GLP-1 or dual GIP/GLP-1 therapy?
To prevent sarcopenic obesity (the loss of skeletal muscle mass while retaining visceral body fat) and protect organ metabolic rate, clinical endocrinology consensus establishes a minimum safety floor of 1,200 daily calories for women and 1,500 calories for men, unless directly supervised under an inpatient medical fasting protocol.
Why do GLP-1 weight loss patients require up to 50% more daily protein than standard dieters?
Clinical trial DEXA body composition analyses reveal that up to 35% to 40% of total weight lost on semaglutide can come from lean body mass. Elevating daily protein intake to 1.2–1.5 grams per pound of Lean Body Mass (LBM)—paired with progressive resistance training—is the proven clinical defense against myofibrillar muscle degradation.
How does the Boer Lean Body Mass formula improve caloric accuracy for obese individuals?
In individuals with Class II or III obesity, standard weight-based TDEE formulas severely overestimate resting caloric expenditure because adipose fat is metabolically inert compared to muscle. The validated Boer formula isolates true Lean Body Mass (bone, water, organ, and muscle tissue), providing an accurate baseline for protein dosing and caloric floors.
How does GLP-1 therapy interact with continuous glucose monitors (CGMs) and insulin sensitivity?
GLP-1 receptor agonists enhance glucose-dependent insulin secretion and suppress postprandial glucagon release. By pairing our macro calculator with continuous glucose monitoring (CGM) data, patients can identify complex carbohydrate thresholds that maintain flat 24-hour glycemic curves without triggering gastrointestinal nausea.