Can food-triggered acne reflect gut-immune-skin signaling?

The pathophysiology of food-triggered acne is mediated by a coordinated gut-immune-skin signaling cascade, where dietary inputs directly modulate systemic inflammation and cutaneous biology.

Intestinal permeability and systemic inflammation

• Barrier dysfunction: Intestinal barrier hyperpermeability and gut dysbiosis permit the translocation of dietary antigens and microbial products, such as lipopolysaccharides (LPS), into the bloodstream.
• Immune activation: This translocation triggers low-grade, systemic inflammatory cascades characterized by the release of pro-inflammatory cytokines, including interleukin-1 (IL-1), IL-6, and tumor necrosis factor-alpha (TNF-α).

Mechanistic cutaneous modulation

• Endocrine-sebaceous signaling: High-glycemic diets and dairy intake elevate circulating insulin and insulin-like growth factor 1 (IGF-1). This triggers PI3K/Akt-dependent nuclear export of FoxO1, subsequently overactivating mTORC1 in sebocytes.
• Dysseborrhea and keratinization: mTORC1 activation drives excessive sebaceous lipogenesis, alters sebum lipid composition, and promotes follicular hyperkeratinization.
• Lesion development: This altered microenvironment fosters Cutibacterium acnes proliferation, which activates toll-like receptor 2 (TLR2) and Th17/IL-17 pathways, culminating in localized follicular inflammation and clinical acne.

Bottom line

• Dietary antigens and endocrine triggers cross a compromised intestinal barrier to drive systemic inflammation and mTORC1-mediated sebaceous lipogenesis, establishing a direct gut-immune-skin axis that fuels acne pathogenesis.