The Study
The Impact of Aging, Calorie Restriction and Dietary Fat on Autophagy Markers and Mitochondrial Ultrastructure and Dynamics in Mouse Skeletal Muscle.
This study looks at muscle changes in mice on different diets and calorie levels. It can show that certain diets are linked to healthier muscle cells, but it can't prove one diet causes better health. It's like noticing that kids who eat more veggies seem healthier, but not knowing if the veggies are the real reason.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When mice eat much less food, what kind of fat they eat matters. Mice that ate lard (from pigs) stayed healthier in their muscles and lived longer than mice that ate oils from plants or fish.
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 58 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This study was in mice, so we can't say for sure if it works the same in humans, but it shows that fat type might matter when eating less to live longer.
- 2Mice on a low-calorie diet with lard had healthier muscles and mitochondria.
- 3They lived longer than mice on the same low-calorie diet with soybean or fish oil.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The journals of gerontology. Series A, Biological sciences and medical sciences
Year
2018
Authors
Elena Gutiérrez-Casado, Husam Khraiwesh, J. López-Domínguez, Jesús Montero-Guisado, G. López-Lluch, P. Navas, R. de Cabo, J. Ramsey, J. González-Reyes, J. M. Villalba
Related Content
Claims (5)
Mice that eat fewer calories live longer, and among those on a low-calorie diet, the ones eating mostly lard seem to live the longest.
If you eat less food, having more saturated fats in your body might help you live longer.
In male mice on a severely reduced diet, the type of fat they eat matters — lard (like bacon fat) seems to keep their muscle cells healthier at a microscopic level better than vegetable or fish oils.
When older male mice eat fewer calories, they tend to keep healthier muscles and energy-producing parts inside their cells—especially if their diet includes a lot of saturated fat like from lard.
In male mice eating 40% fewer calories, the type of fat they eat matters — mice live longer on more saturated fats like lard than on unsaturated fats like soybean or fish oil.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.