The number of children admitted to hospital with severe allergic reactions rose 72% in five years, new figures show.
According to NHS Digital, there were 1,746 cases of anaphylactic shock in those aged 18 and under in 2018-19, compared to 1,015 in 2013-14.
The increase in children ages 10 and under was 200%, from 110 to 330, and London was the region with the highest jump of 167% – from 180 to 480.
The data came from a foundation founded by the parents of Natasha Ednan-Laperuz, a teenager who died after not knowing eating sesame seeds, who was allergic to a Pret a Manger sandwich.
Her mother, Tania Ednan-Laperouz, said the "frightening numbers" showed the UK was facing "urgent allergies".
She added: "The number of children with allergies and suffering from severe allergic reactions is increasing year by year at a deeply disturbing rate.
"Scientists still do not understand why the number of children with allergies is growing, so it is necessary to invest in large research projects in both the causes and possible remedies."
Natasha was 15 when she suffered a fatal allergic reaction to a flight between London and Nice in 2016, and the sesame seeds in her baguette were not listed on the label.
Her parents campaigned for legislation to make all packaged food clearly labeled, and in June the government announced it "Natasha's Law" would do exactly that when it comes into force in 2021.
The reaction suffered by Natasha, anaphylaxis, causes symptoms such as difficulty breathing, difficulty breathing, severe rash, light or weak feeling, and rapid heartbeat.
Common triggers include nuts, milk, fish, mussels, eggs and fruits, and experts believe that children are more likely than ever to develop allergies to such foods.
Hassan Arshad, a professor of allergy and clinical immunology at the University of Southampton, said: "These new numbers confirm what we know is a worrying increase in severe food allergy.
"We should not forget that behind each of these numbers is a child or an adult who has suffered the most severe consequences of anaphylactic shock. For too long, allergies have been considered a minor nuisance. It is time for everyone to focus on preventing and treating allergies."
Data obtained from the Natasha Allergy Research Foundation includes a regional survey of hospital admissions, which showed that the East Midlands saw the second largest increase – by 145%.
Growth in the East was 84%, followed by West Midlands (59%), North West (56%), Yorkshire and Humber (50%), Southwest (24%) and South East (22%).
In the north-east, the number remained static.
And when adults are involved, a comprehensive jump of 34% is observed from 4,107 cases to 5,497.
Ms Ednan-Laperuze added: "We lost our beautiful daughter Natasha to anaphylaxis after eating an allergen hidden in food. We do not want to see any other family face the dreadful sadness we will always endure. So we set out to the Foundation for Natasha's allergy research with the ultimate goal of finding a cure for allergies. "