The Study
Potential effects of reduced red meat compared with increased fiber intake on glucose metabolism and liver fat content: a randomized and controlled dietary intervention study.
This study didn't prove that eating less red meat or more fiber makes you healthier on its own. It showed that if you eat fewer calories, you get healthier—no matter what else you eat. So we can't say red meat or fiber directly caused the changes.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When people eat fewer calories, their body burns fat — including fat in the liver — no matter if they stop eating red meat or eat more fiber.
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 555 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this means for people trying to improve metabolic health, cutting calories matters more than focusing only on red meat or fiber.
- 2People lost 3.3 kg on average, their liver fat dropped significantly, and their blood sugar and insulin improved — but only because they ate fewer calories, not because of changes in meat or fiber.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The American journal of clinical nutrition
Year
2019
Authors
Caroline Willmann, M. Heni, K. Linder, R. Wagner, N. Stefan, J. Machann, M. Schulze, H. Joost, H. Häring, A. Fritsche
Related Content
Claims (5)
Obese adults at increased risk of type 2 diabetes who reduce their daily calorie intake by 400 kcal for six months lose an average of 3.3 kg and experience significant decreases in fat around their organs and throughout their body.
When obese adults at risk of type 2 diabetes reduce their calorie intake, their blood sugar control and liver fat improve, but adding more fiber or cutting out red meat does not make these improvements any better.
In obese adults at high risk for type 2 diabetes, reducing daily calorie intake by 400 kcal for six months improves glucose tolerance, increases insulin sensitivity, and reduces liver fat, regardless of whether red meat consumption is lowered or fiber intake is raised to 40 grams per day.
For obese adults at high risk of type 2 diabetes, adding lower red meat intake or 40 grams of fiber per day to a calorie-restricted diet does not improve glucose metabolism, insulin sensitivity, or reduce liver fat more than calorie restriction by itself.
Among obese adults at high risk for type 2 diabetes, decreases in liver fat during calorie restriction are associated with decreases in blood ferritin levels.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.