Sugar overflow pathway
Sorbitol pathway NADPH consumption↓
Also searched as Sorbitol pathway NADPH consumption.
The Mechanism Behind Diabetic Complications in Tissues that do not need Insulin to take up Glucose — nerve, retina, lens, kidney. Sorbitol accumulates osmotically and the conversion consumes nadph, which is the same nadph glutathione regeneration needs. Damage by two routes at once.
In depth
The sorbitol pathway — where excess glucose is shunted when the normal routes saturate. It consumes nadph, which is how high blood sugar becomes an antioxidant deficit in nerve and lens tissue.
What drives it
Fasting insulin increases it.
Excess glucose is diverted through aldose reductase when the normal routes saturate. Carried by the intermediary-metabolism and clinical reviews. doi 10.1016/j.molmet.2023.101755 · PMC9967593
Blood-sugar support increases it.
Intracellular glucose excess drives aldose reductase flux through the polyol pathway: 'AR reduces glucose into sorbitol at the expense of NADPH' (doi 10.3389/fphar.2012.00087 - Aldose reductase, oxidative stress, and diabetic mellitus, Front Pharmacol 2012). The cost is the NADPH the cell also needs to regenerate its own antioxidant. doi 10.3389/fphar.2012.00087
What it drives
It increases Nerve protection.
The mechanism behind diabetic complications in tissues that do not need insulin for glucose uptake - nerve, retina, lens, kidney. Carried by the intermediary-metabolism and clinical reviews. doi 10.1016/j.molmet.2023.101755 · PMC9967593
It reduces Vision.
Osmotic sorbitol accumulation in the lens. Carried by the intermediary-metabolism and clinical reviews. doi 10.1016/j.molmet.2023.101755 · PMC9967593
It reduces Kidney.
Same mechanism in renal tissue. Carried by the intermediary-metabolism and clinical reviews. doi 10.1016/j.molmet.2023.101755 · PMC9967593
It reduces Reducing power supply.
Damage by two routes at once: the conversion consumes NADPH, which is the same NADPH glutathione regeneration needs. Carried by the intermediary-metabolism and clinical reviews. doi 10.1016/j.molmet.2023.101755 · PMC9967593
It increases Supports lens clarity.
The modifiable and non-modifiable risk factors identified in this study provide insight into the mechanisms related to the development of lens opacification. Improved glycemic control, smoking cessation and…. PMID 22197433
It increases Supports the retina.
AGEs and their receptor RAGE may directly induce superoxide through aldose reductase (AR) and/or other mechanisms. PMC12189886
Blends that modulate it
Each blend page names this pathway and carries the study behind its claim.
See it on the map
Open the causal map to follow this pathway upstream and downstream, arrow by arrow, each with its study.