New Department for Transport guidance says any grub or powders should be packed in hold baggage.
Many passengers take their own snacks to eat on board when they fly to avoid paying higher prices charged by airports or airlines.
The DfT says storing food in hand luggage can obstruct images on the X-ray machine or may be mistaken for suspicious items, leading to additional checks.
Passengers will not be stopped from travelling with food, but those that do should “allow extra time at security” for checks, the guidance warned.
There are already rules banning travel with liquids, gels and pastes of more than 100 millilitres, sharp items and tools.
Aviation minister Baroness Sugg said: “We have some of the strongest aviation security measures in the world, and the restrictions are in place for a good reason — to keep passengers safe.
“By simply checking the guidance before they set off for the airport, passengers can have a smoother and less stressful start to their journey.”
British Airways is among the older carriers that have recently stopped offering free refreshments to economy passengers to compete with low-cost airlines.
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