The Study
Effect of Chronic Moderate Caloric Restriction on the Reproductive Function in Aged Male Wistar Rats
This study is like doing a science project with a group of older rats to see if eating less food affects their bodies. It shows that when these rats ate less food for several months, some things in their bodies worked better compared to rats that ate normally. But because it's just a rat study and not a carefully controlled experiment with people, we can't say for sure that the same thing would happen in humans.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
When older rats ate less food for 6 months, they had better mating behavior, more sperm movement, and higher testosterone, but it didn't last after a year.
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 510 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This is in rats; human effects are unknown.
- 2Testosterone went from 0.57 to 1.75-2.10; sperm movement from 43.8% to 50-56.6%; only 33% kept benefits after 12 months.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutrients
Year
2022
Authors
Pablo López de Jesús, E. Arenas-Ríos, M. Ruiz-Ramos, J. C. Flores-Alonso, V. Mendoza-Núñez, I. Arrieta-Cruz, M. Arteaga-Silva
Related Content
Claims (7)
Researchers found that when they put middle-aged male rats on a diet with 15% or 35% fewer calories, it helped their reproductive health at first. But after a year on the diet, these benefits went away, and only one-third of the dieting rats still showed normal mating behavior compared to all of them at six months.
Eating less food for six months helped older male rats have better sex lives by making them mount and mate faster and ejaculate more often, compared to rats that could eat as much as they wanted.
When rats eat less food for several months, their testosterone levels go up compared to rats that eat normally.
When older male rats eat less food for several months, their bodies process sugar better and have healthier hormone levels.
When male rats ate less food for several months, their testicles showed fewer signs of cell death compared to rats that ate normally. This was measured using a special light test that detects dying cells.
Eating less food for six months helped older male rats have better swimming sperm, and this improvement lasted for a year compared to rats that ate normally.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.