The Study
Health Effects of Increasing Protein Intake Above the Current Population Reference Intake in Older Adults: A Systematic Review of the Health Council of the Netherlands
This study looked at lots of experiments where older people ate more protein to see if it helped them stay strong and healthy. It found that sometimes it helped with muscle, but not always — like when they also did exercise. But in many cases, it didn’t help at all. So we can’t say for sure that more protein fixes everything.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
This study looked at whether older people who already eat enough protein get stronger or healthier by eating even more.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 576 / 100
Quality score
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The muscle mass gains were small and didn't change overall weight; strength gains were tiny (under 5%) and only happened with exercise; no real improvement was seen in walking, balance, or bone health.
- 2More protein helped 7 out of 18 studies slightly increase muscle mass (by 0.8–2.0 kg), and helped 3 out of 8 studies improve strength—but only if people also did weight training.
- 3Without exercise, only 1 out of 7 studies saw any strength gain.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Advances in Nutrition
Year
2021
Authors
Linda M Hengeveld, J. de Goede, L. Afman, S. Bakker, J. Beulens, E. Blaak, E. Boersma, J. Geleijnse, J. V. van Goudoever, M. Hopman, J. Iestra, S. Kremers, R. Mensink, N. D. de Roos, C. Stehouwer, J. Verkaik-Kloosterman, E. de Vet, M. Visser
Related Content
Claims (5)
In older adults, eating more protein does not consistently change blood fat levels; some studies show improvements in certain lipid markers while others show no benefit or different effects, and the positive results come from studies with methodological flaws.
In adults aged 65 and older who already consume at least 0.8 grams of protein per kilogram of body weight daily, increasing protein intake beyond this level results in a small increase in lean body mass, typically between 0.8 and 2.0 kilograms after 10 to 12 weeks, without changing total body weight.
Older adults who consume more protein and do resistance training show small but measurable increases in muscle strength during knee extension and chest press exercises, compared to those who consume more protein without doing resistance training.
In older adults, eating more protein without doing physical exercise does not change muscle strength.
In older adults, eating more protein does not improve physical performance or bone health.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.