Hormonal
Physiological levels of reactive oxygen species (ROS), specifically hydrogen peroxide (H2O2), act as essential signaling molecules that augment insulin sensitivity and glucose uptake in skeletal muscle by inhibiting negative regulators like PTP1B and activating Akt.
Do not assume that high-dose antioxidant supplements improve insulin sensitivity. In healthy or early-stage metabolic contexts, your body relies on low levels of oxidative stress (ROS) to signal insulin to move glucose into muscles. Blocking this signal with excessive antioxidants may actually impair glucose uptake and metabolic adaptation.
Physiological or transient increases in ROS amplify insulin sensitivity, whereas chronic or excessive ROS generation disrupts signaling and contributes to insulin resistance... H2O2 can enhance insulin signaling by promoting tyrosine phosphorylation of IRS proteins and augmenting PI3K–Akt activation... Insulin-stimulated H2O2 inhibits the negative regulator PTP1B, thereby enhancing insulin’s action and downstream effects.
Why this rating
The paper is a comprehensive review citing multiple mechanistic studies in human and mouse models, though it notes gaps in contemporary human subject data.
Source
Redox Homeostasis in Metabolic Syndrome and Type II Diabetes: Role of Skeletal Muscle and Impact of Gold-Standard Treatments
Mia Wilkinson et al. · International Journal of Molecular Sciences · 2025
DOI 10.3390/ijms262110370
More from this paper
- Chronic nutrient overload and sedentary behavior lead to 'oxidative distress' (excessive ROS), which causes insulin resistance in skeletal muscle by activating stress kinases (JNK, p38 MAPK) that inhibit insulin signaling.Good
- Gold-standard T2DM medications (metformin, SGLT2 inhibitors, GLP-1 agonists) modulate the redox state of skeletal muscle, potentially restoring metabolic function and insulin sensitivity.Moderate
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