What is the difference between a food allergy and a food intolerance?

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1. 1

   Food allergy and intolerance

   Acta Chimica Slovaca (Petruláková & Valí­k)Published Apr 1, 2015Checked Oct 11, 2026

   “Allergic reactions to foods represent severe actual problems for mankind having increased global character. Adverse food reactions are divided to food allergy, an immunological response to food, and food intolerance, a non-immune reaction with allergy-like symptoms. It is estimated that 6–8 % of children and 1–2 % of adults suffer from food allergy. The prevalence of food intolerance in adults is no more than 5–6 %, however in infants and young children, it is varied from 0.3 % to 20 %. Allergy is caused by different food allergens (milk proteins, cereals, nuts, fruits and vegetables), while there is frequent cross-allergy among them. Food intolerance is adverse reaction resulting from enzyme deficiencies, pharmacological reactions, and response to toxic or irritant components of food. Focusing on dairy products and cereals, the impact of fermentation in reducing food intolerance or allergenicity is reviewed in this paper.”

2. 2

   Food Intolerances, Food Allergies and IBS: Lights and Shadows

   Nutrients (Pasta et al.)Published Jan 16, 2024Checked Oct 11, 2026

   “Food and dietary habits play a crucial role in IBS management. About 85-90% of IBS patients report symptom exacerbation linked to specific food consumption, highlighting the strong connection between food intolerances and IBS. Food intolerances often exhibit a dose-dependent pattern, posing a challenge in identifying trigger foods. This issue is further complicated by the complex nature of gastrointestinal physiology and varying food compositions. This review discusses various dietary patterns and their impact on IBS, including the low-FODMAP diet, gluten-free diet, and Mediterranean diet. It highlights the importance of a personalized approach in dietary management, considering individual symptom variability and dietary history. In conclusion, this review emphasizes the need for accurate diagnosis and holistic management of IBS, considering the complex interplay between dietary factors and gastrointestinal pathophysiology. It underlines the importance of patient education and adherence to treatment plans, acknowledging the challenges posed by the variability in dietary triggers and the psychological impact of dietary restrictions.”

3. 3

   Knowledge of lactose intolerance in Italian adults: a cross‑sectional assessment.

   European journal of nutrition (Carioni et al.)Published Sep 24, 2026Checked Oct 11, 2026

   “Univariable and multivariable ordinal logistic regression were carried out to investigate the association between respondents' characteristics and LI knowledge.ResultsA total of 2025 respondents (85.4% female) were included in the analysis. The mean knowledge score was 15.4 ± 7.6. Overall, 36.6% of respondents showed low, 32.2% intermediate, and 31.2% high knowledge. Common misconceptions concern the belief that trace amounts of lactose (e.g., in lactose-free products or medications) can trigger symptoms and that a lactose-free diet does not pose a risk for nutritional deficiencies. Questions on unvalidated diagnostic methods elicited many "I don't know" responses, reflecting uncertainty about their reliability. Female gender, confirmed LI diagnosis, higher education and nutrition training were associated with higher knowledge, with the latter showing the strongest association (Odds Ratio 10.8, 95% CI: 8.30-14.2).ConclusionThese findings highlight persistent misconceptions about LI and underscore the need for targeted educational strategies to improve public understanding and reduce inappropriate diagnostic and dietary practices.”

4. 4

   Food Hypersensitivity: Diagnosing and Managing Food Allergies and Intolerances

   Journal of Allergy (Venter)Published Nov 11, 2012Checked Oct 11, 2026

   “of patient education and support groups, the effect of food production on the allergenicity of foods, and the induction of oral tolerance.This special issue is concluded with a tutorial from expert allergy dietitians on the diagnosis and management of FHS in children.Food hypersensitivity includes a wide spectrum of symptoms and mechanisms.Many researchers and clinicians have discussed the possible role of the gut (barrier) and the mucosal immune system in the development of food allergies.Factors that have been addressed in particular include weaning and the weaning diet [4], age of solid food introduction and breast feeding [5], gut bacteria [6], and gastrointestinal infections [7].What is clear is that a better understanding of the immunological mechanisms involved in sensitisation and tolerance will enhance our efforts of allergy prevention and discovering novel treatments.L. C.-H. Yu discusses in the review paper "Intestinal epithelial barrier dysfunction in food hypersensitivity" the epithelial barrier dysfunction in sensitized intestines with particular reference to the enhanced transcytotic rates of allergens and the mechanisms involved in development of sensitisation.They”