Mia Shay St Hilaire, a 12-year-old girl, died after suffering a severe allergic reaction to a milkshake prepared at a cafe in London, England. According to reports published on October 9, 2026, a coroner’s findings linked the fatal reaction to hazelnut contamination from a blender that had previously been used to prepare a different drink containing nuts.
St Hilaire had visited the Pop Inn cafe with her aunt and sister and ordered a Twix milkshake. Although the drink was not supposed to contain the ingredient responsible for her life-threatening tree nut allergy, the blender had reportedly just been used to make a Kinder Bueno milkshake containing hazelnuts. The equipment was not cleaned before her order was prepared.
According to the coroner’s findings cited in the reports, Mia developed rapidly progressing anaphylaxis after drinking the milkshake. Anaphylaxis is a serious allergic reaction that can affect multiple body systems and become life-threatening without urgent treatment. She later collapsed at her aunt’s home, received emergency medical care, and was transferred to the intensive care unit at Evelina London Children’s Hospital, where she died.
CCTV footage reportedly captured cafe owner Baris Yucel preparing the milkshake without first washing the blender. The case raised serious concerns about food preparation procedures and the risks posed by cross-contamination, particularly for customers with severe food allergies.
Following Mia’s death in August 2023, Yucel admitted to six violations of the Food Safety Act. These included failing to make allergen information available or visible to customers, failing to manage contamination during food preparation, and serving food containing an allergenic ingredient that should not have been present. The cafe was fined £18,000, and Yucel was ordered to complete 100 hours of community service. Reports also stated that he no longer owns or operates the cafe.
Mia’s parents expressed profound grief over the loss of their daughter and called for stronger protections for people living with food allergies. They said they believed Mia might still be alive if the local authority had ensured that the cafe’s responsibilities for managing allergens were properly understood and followed. The family has called for clearer allergy-management standards, including a separate rating system that would help customers assess how food businesses handle allergen risks.
The tragedy has renewed attention on the importance of preventing cross-contamination, communicating allergen information clearly, and following strict food safety procedures. For families managing severe food allergies, even small mistakes during food preparation can have devastating consequences. Mia’s parents hope that changes prompted by their daughter’s death will help protect others and prevent similar tragedies.
Mia Shay St Hilaire’s life was cut short at just 12 years old, leaving her family to endure an immeasurable loss. Her parents have vowed to keep her memory alive by advocating for improvements in food allergy safety and helping protect other children and families.
May Mia Shay St Hilaire rest in peace.