The Claim

In female rats, fructose supplementation increases aortic inducible nitric oxide synthase (iNOS) expression and reduces phosphorylation of vasodilator-stimulated phosphoprotein (VASP) at Ser239, leading to impaired nitric oxide-mediated vascular relaxation independent of endothelial-dependent vasodilation.

Source: Type of supplemented simple sugar, not merely calorie intake, determines adverse effects on metabolism and aortic function in female rats.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
19score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

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.

See the scientific wording

In female rats, fructose supplementation increases aortic inducible nitric oxide synthase (iNOS) expression and reduces phosphorylation of vasodilator-stimulated phosphoprotein (VASP) at Ser239, which is associated with impaired nitric oxide-mediated vascular relaxation, independent of endothelial-dependent vasodilation.

Why this might work

Fructose causes the blood vessel walls to make too much of a harmful form of nitric oxide synthase, which creates toxic molecules that destroy the good nitric oxide needed to relax blood vessels. At the same time, fructose reduces the activity of a key protein that helps nitric oxide signal relaxation, making the vessels stiff and unable to widen properly.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Type of supplemented simple sugar, not merely calorie intake, determines adverse effects on metabolism and aortic function in female rats.

    In female rats, drinking sugary fructose water made their blood vessels less able to relax when signaled by nitric oxide, even though other ways to relax the vessels still worked. This suggests fructose specifically messes up the body’s nitric oxide system.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.