The Study
Fructose- and sucrose- but not glucose-sweetened beverages promote hepatic de novo lipogenesis: A randomized controlled trial.
This study found that drinking drinks with fructose or sucrose made the liver make more fat than drinking drinks with just glucose — but we can't be 100% sure because we didn't see the full study. It's like seeing a magic trick and saying 'it worked!' without knowing how the magician did it.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
This study gave men daily sugary drinks with different sugars to see how their livers reacted.
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 — doubling liver fat production in 7 weeks could contribute to fatty liver and heart disease risk over time.
- 2Fructose and sucrose drinks doubled liver fat production (from 9% to ~20% per day).
- 3Glucose drinks did not change it.
- 4Total calories and body fat burning stayed the same.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of hepatology
Year
2021
Authors
Bettina Geidl-Flueck, M. Hochuli, Ágota Németh, A. Eberl, Nina Derron, H. Köfeler, L. Tappy, K. Berneis, G. Spinas, P. Gerber
Related Content
Claims (5)
If healthy men eat about 80 grams of sugar (like table sugar or fruit sugar) every day for 7 weeks, their body still burns fat normally in muscles and blood—but their liver starts making more fat.
If healthy men eat 80 grams of fructose or table sugar every day for 7 weeks, their liver starts making and releasing about twice as much fat as before—but eating the same amount of plain glucose doesn’t do that.
Even when people eat the same number of calories, drinking fructose or sucrose drinks still makes the liver make more fat — so it’s not just because they’re eating too much.
Eating too much fructose, like the sugar in soda and candy, can mess up your liver’s ability to respond to insulin, make more fat in your liver, and raise fat levels in your blood, which can lead to bigger health problems like heart disease.
Eating too much fructose, like the sugar in soda and sweet snacks, makes your liver create more fat, which raises bad fats in your blood and causes body-wide inflammation, making heart disease more likely.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.