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A growing number of people are following gluten-free diets. For many it's because this protein can make them unwell.
It's in a huge amount of food and drink products and it's hard to avoid - but what does gluten actually look like?
Baker Lizzie Parle of the E5 Bakehouse in London demonstrates the properties of gluten, by pumping it up like a balloon.
麻豆官网首页入口's The Food Chain visited her bakery as part of a programme devoted to the issue of gluten.
Video Journalist: Dougal Shaw