Staff must provide information on 14 everyday allergens including nuts, milk, celery, gluten, soya and wheat.
The new measures, which come into force on December 13, cover meals served in bakeries, cafes, care homes and packaged produce sold by supermarkets.
There may be fines for repeat offenders.
Experts say the majority of these deaths and visits to hospital are avoidable, and some are a result of people being given incorrect information about ingredients.
Businesses can choose how they give the information on allergens contained in their food – for example through conversations with customers, leaflets, food labeling or by highlighting ingredients on menus.
If allergy advice is not clearly given, the Food Standards Agency says there need to be clear signs about where it can be obtained.
Pre-packaged food bought in supermarkets must also have clear allergen information on the labels.
Under the new legislation (EU FIC Food Information for Consumers Regulation), customers must be told if their food contains any of the following:
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