Flavonoids for allergic diseases: present evidence and future perspective.

Area of Science:

• Nutrition Science
• Immunology
• Pharmacology

Background:

• Allergic disease prevalence has risen globally.
• Dietary habits are implicated as environmental factors influencing allergy onset and severity.
• Flavonoids, abundant in plant-based foods, exhibit antioxidant, anti-allergic, and immune-modulating properties.

Purpose of the Study:

• To explore the potential role of dietary flavonoids in preventing and managing allergic diseases.
• To review the mechanisms by which flavonoids exert anti-allergic effects.
• To assess epidemiological and experimental evidence supporting flavonoid intake for allergy control.

Main Methods:

• Review of scientific literature on flavonoid bioactivity and allergic diseases.
• Analysis of epidemiological studies linking flavonoid intake to allergy incidence.
• Examination of in vitro and in vivo studies on flavonoid mechanisms in allergic models.

Main Results:

• Flavonoids inhibit mast cell and basophil activation, suppressing inflammatory mediator release.
• Flavonoids modulate T-helper 2 (Th2) cytokine synthesis (e.g., IL-4, IL-13) and CD40 ligand expression.
• A Finnish cohort study indicated lower asthma incidence with high flavonoid intake; studies in allergic models show benefits.

Conclusions:

• Dietary flavonoids demonstrate significant potential in preventing and ameliorating allergic conditions.
• Further human studies are needed, but flavonoids are promising for allergy management.
• Appropriate flavonoid consumption may be a key dietary strategy for reducing allergy burden.