The Study
Type of supplemented simple sugar, not merely calorie intake, determines adverse effects on metabolism and aortic function in female rats.
This study looked at what happens when rats drink sugary water — some got glucose, some got fructose. It found that fructose made their bodies work worse than glucose, even when they drank more sugar water. But this doesn't mean the same thing happens in people — it's just a clue for scientists to check further.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Even when rats ate fewer calories, drinking fructose made their livers store more fat and their blood vessels less able to relax, while glucose made their blood vessels work better.
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 519 / 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.
- 1Yes — this suggests that in humans, fructose in sodas may harm the liver and heart more than table sugar, even without weight gain.
- 2Fructose raised triglycerides by 24% and reduced liver fat-burning protein (L-CPT-1A) by 50%; glucose raised adiponectin by 159% and improved blood vessel relaxation to nitric oxide.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
American journal of physiology. Heart and circulatory physiology
Year
2017
Authors
Gemma Sangüesa, Sonali S. Shaligram, Farjana Akther, N. Roglans, J. Laguna, Roshanak Rahimian, M. Alegret
Related Content
Claims (6)
High intake of fructose leads to fat buildup in the liver and is associated with impaired metabolic function.
In female rats, adding fructose to the diet lowers a key liver protein involved in burning fat and raises a protein that packages fat for export, causing fat to build up in the blood without increasing total calories consumed.
In female rats, consuming fructose or glucose reduces key proteins involved in insulin signaling in the liver and blood vessels, and fructose causes a larger reduction than glucose, even when calorie intake is controlled.
Female Sprague-Dawley rats fed a diet with 20% fructose in their drinking water for 8 weeks develop higher blood triglycerides, worse liver insulin resistance, and reduced blood vessel relaxation in response to nitric oxide compared to rats fed glucose, even when they consume fewer total calories.
In female rats, consuming fructose increases a specific protein (iNOS) in the aorta and decreases phosphorylation of another protein (VASP at Ser239), resulting in reduced relaxation of blood vessels due to impaired nitric oxide signaling, without affecting endothelial-dependent vessel dilation.
In female rats, glucose supplementation raises levels of adiponectin and PPARα in the liver, which correlates with increased phosphorylation of eNOS and greater relaxation of the aorta when exposed to nitric oxide donors, even though glucose provides more calories than fructose.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.