Research
Mixed
Obesity medications (OMs) such as semaglutide and tirzepatide cause significant weight loss but also result in lean mass loss, necessitating targeted nutritional and exercise interventions to preserve skeletal muscle.
OMs like semaglutide and tirzepatide are highly effective for weight loss but can cause muscle loss. To counter this, eat enough protein (0.8-1.5 g/kg/day depending on your age/health) and do resistance exercises. This helps protect your muscle while you lose fat.
GoodQualifiesHIGH confidence
The weight reduction achieved with OMs is not thought to cause physical frailty or progressive muscle mass loss (sarcopenia)... Some lean mass can be lost during weight reduction, which can in turn result in decreased bone mineral density, insulin sensitivity, and aerobic capacity
Why this rating
Based on multiple phase 3 trials (STEP, SURMOUNT) and meta-analyses cited in the paper.
Source
Evolution of multidisciplinary obesity treatments: past, present, and future role of nutrition
Steven B. Heymsfield et al. · Obesity · 2025
DOI 10.1002/oby.24340
narrative_reviewCited 2×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- To preserve skeletal muscle mass during obesity treatment with obesity medications (OMs) or caloric restriction, patients should consume 0.8 g/kg/day of high-quality protein (minimum 60-80 g/day), with higher requirements (1.0-1.5 g/kg/day) for older adults and those with chronic diseases.Moderate
- Supplementation with β-hydroxy β-methylbutyrate (HMB) may preserve fat-free mass and increase muscle strength in individuals undergoing weight reduction, although robust evidence in obesity patients is lacking.Limited
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
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