Patients with chronic urticaria often assume that food is the main cause of their condition, but a new study suggests these perceived triggers might lead to unnecessary dietary restrictions. A cross-sectional study published in the Indian Journal of Allergy, Asthma and Immunology in July 2026 found that while over 45% of patients report food as a primary trigger, only a fraction of these patients actually test positive for those specific allergies.
Researchers from Bengaluru’s Kempegowda Institute of Medical Sciences analyzed 120 dermatology outpatients to compare self-reported food habits with clinical features. The study found that 69.2% of patients suffered from chronic inducible urticaria (CIndU), which is significantly more common than chronic spontaneous urticaria (CSU) at 30.8%. Despite these numbers, the investigators noted a significant gap between what patients believe they are allergic to and what the tests show.
Approximately 45.8% of the participants self-reported food as an allergen trigger. However, only 30.8% demonstrated objective skin prick test positivity. Prawns were identified as the most frequent allergen among those who tested positive, appearing in 22.7% of cases. This discrepancy raises questions about the validity of self-diagnosis in chronic skin conditions.
Unexpected Dietary Trends
The investigation into local food habits revealed some surprising patterns regarding dairy and energy intake. Investigators observed that consuming milk and milk products more than twice weekly was associated with significantly fewer allergic symptoms compared to weekly consumption. The statistical significance was notable, with a p-value of 0.023.
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Conversely, a higher intake of energy-dense foods, defined as consumption twice weekly, correlated with a greater incidence of allergic manifestations compared to once-weekly consumption. The p-value for this finding was 0.027. These results challenge the common assumption that all restrictive diets improve symptoms for patients with this condition.
One specific finding stood out regarding comorbidities. The study noted a negative correlation where patients with comorbidities exhibited significantly less multiorgan involvement, such as issues with the eyes, ears, or chest alongside the skin, compared to those without comorbidities. This statistical relationship had a p-value of 0.039.
Guiding Treatment and Diet
While sixty-five point eight percent of patients report avoiding specific foods due to fear of triggers, the results suggest there is no direct association between overall dietary patterns and the severity or chronicity of urticaria. The authors argue that this widespread avoidance often leads to nutritional deficiencies without providing clinical benefit.
Clinicians are advised to systematically evaluate dietary histories rather than relying on patient assumptions. The study recommends guiding patients toward targeted avoidance of verified triggers or evidence-based regimens, such as pseudoallergen-free diets. Doctors should actively discourage unverified self-imposed food restrictions.
