In this study, 211 carers of children and adults with atopic eczema/dermatitis (AE) completed an online questionnaire about diet and allergy. The study group comprised 106 children [mean age 5 years, Patient-Oriented Eczema Measure (POEM) score mean ± SD 13.8 ± 7.8] and 105 adults (mean age 35 years, POEM score 14.5 ± 7.5). We found that 57% of respondents had discussed the role of diet in AE with a health professional and 38% felt this discussion was unhelpful or very unhelpful. Regarding testing, 54% reported having had an allergy test. Food exclusion was common; 68% of children and 46% of adults excluded one or more foods from their diet, with 40% of children and 52% of adults doing so to reduce AE symptoms. The most commonly avoided food among both children (63%) and adults (50%) was cow's milk. Only 17% of adults with modified diets had received dietary advice from a dietitian, compared with 57% of children. Clinicians should routinely ask patients about their views of diet in eczema and any changes that they have made, offering objective assessment where appropriate.