Unhealthy Diets Induce Distinct and Regional Effects on Intestinal Inflammatory Signalling Pathways and Long-Lasting...

Area of Science:

• Gastroenterology and Nutritional Science
• Immunology
• Metabolic Health

Background:

• The intestinal epithelium detects environmental agents, involving inflammation and stress pathways.
• Chronic nutrient intake's impact on intestinal inflammation across regions remains unclear.
• Understanding early dietary influences on gut health is crucial for preventing obesity-related disorders.

Purpose of the Study:

• To investigate how unhealthy dietary patterns (sugary beverages and Western diet) affect metabolic dysfunction, intestinal inflammation, and obesity.
• To determine the region-specific inflammatory responses in the intestine.
• To link early-life diet to adult metabolic and inflammatory outcomes.

Main Methods:

• Utilized a rat model to study the effects of high-sugar (HSD) and Western (WD) diets.
• Assessed adiposity index, blood glucose, and triglyceride levels.
• Analyzed intestinal gene expression of Toll-like receptors (TLR2, TLR4), nuclear factor-kappa B (NF-κB), and inducible nitric oxide synthase (iNOS).

Main Results:

• Both HSD and WD diets correlated with increased adiposity.
• HSD diet positively correlated with blood glucose and triglycerides; WD diet positively correlated with triglycerides.
• WD diet increased TLR2, TLR4, NF-κB in the colon and iNOS overexpression. HSD diet activated TLR2-mediated NF-κB in the small intestine.

Conclusions:

• Early intake of unhealthy foods acts as an exogenous signal disrupting intestinal immune mechanisms in a region-specific manner.
• Diet-induced intestinal inflammation is linked to metabolic dysfunction and obesity.
• Dietary patterns significantly influence gut health and long-term metabolic outcomes, highlighting the importance of early nutrition.