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Allergy is spreading throughout the population at an alarming rate. At present, one in four British people suffer from an allergy, or have done at some time in their lives. Each year, the number of UK allergy sufferers increases by five per cent. Forty per cent of children now suffer from asthma, eczema or hay fever, and more than one million people have a food allergy.

The difficulties of living with an allergy are highlighted in Channel 4's Allergic to Everything, which follows four families whose lives have been blighted by allergies.