Fruit juices made purely from fruit can have up to 67% of their sugar as fructose, which is about twice as much as glucose, making their sugar profile similar to that of sodas sweetened with...
Mechanism
Synthesis from 1 study
Fruit juice has way more fructose than glucose, and your liver processes fructose in a way that turns it into fat more easily. This can make your body less responsive to insulin over time, similar to what happens with sugary sodas.
Most probable mechanism
When you drink fruit juice, your body gets a lot more fructose than glucose. The liver processes fructose differently than glucose, turning much of it into fat and releasing it into the blood, which can make your body less sensitive to insulin over time.
Fructose is absorbed in the small intestine and transported directly to the liver via the portal vein, where it bypasses key regulatory steps that glucose undergoes.
In the liver, fructose is rapidly phosphorylated and funneled into pathways that promote de novo lipogenesis, leading to increased production of triglycerides and very-low-density lipoproteins.
The high fructose-to-glucose ratio overwhelms hepatic metabolic capacity, reducing insulin sensitivity and impairing glucose uptake in peripheral tissues.
Evidence from Studies
Supporting (1)
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Fructose content in popular beverages made with and without high-fructose corn syrup.
Contradicting (0)
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