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 rarely exceeding 3 kg in the first year without pharmacological aid.
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, your gains slow down a lot—and you probably won't gain more than 3 kg of muscle in a year unless you're using drugs.
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 rarely exceeding 3 kg in the first year without pharmacological aid.
What the research says
1 studyStudy: Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions
This study looks at how muscles grow from weight training and says natural gains are limited — you can’t get super big without drugs, which matches the claim that people usually gain less than 3 kg of muscle in a year.
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.