The Claim
Untrained individuals can expect to gain approximately 1.5 kg of fat-free mass over 8–12 weeks of resistance training, with gains plateauing significantly after the first 6 months, and long-term annual gains typically ranging from 0.5 to 2.5 kg depending on training experience and genetics.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
If you're new to weight training, you can expect to build about 1.5 kg of muscle in the first couple of months, but after six months, the gains slow down a lot—after that, you might only add half to two and a half kilos of muscle per year, depending on your body and how long you've been training.
See the scientific wording
Untrained individuals can expect to gain approximately 1.5 kg of fat-free mass over 8–12 weeks of resistance training, with gains plateauing significantly after the first 6 months, and long-term annual gains typically ranging from 0.5 to 2.5 kg depending on training experience and genetics.
What the research says
1 studyStudy: Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions
This study looks at how lifting weights makes muscles grow and says the gains people see are real but limited — which matches what the claim says about how much muscle you can build over time.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.