UI design for ScanFan app

I often experience awkward meals where friends and family struggle to understand 'gluten intolerance' and run to specialty stores to buy products for celiacs. While I appreciate the effort, celiac's disease and intolerance are not the same thing. The common result is, that I am either excluded from the group meal with a special meal of my own, or everyone eats strange gluten-free substitutes that tend to disappoint and often don't resemble the real thing.

Believe it or not, there are many products that are naturally gluten free without the official 'GF' stickers. Rice, potatoes, corn-tortillas, lentils, vegetables, eggs, meat... The trouble is that it takes time and some knowledge about which processed foods contain which allergens in order to identify them quickly when reading through ingredients lists. This takes a lot of time, as well as trial and error.

I have tried multiple apps for detecting allergies, but often find the UX confusing or the UI very unattractive.

Problem: A person in a supermarket who wants to know if product A contains an allergen. Product A's ingredients list may be kind, designed so that ingredients that typically contain allergens are either in bold or in another colour. But they may not be. Also, the ingredients list could be long, so the person has to spend time carefully reading to detect the allergen. If and when they successfully find the allergen, then they have to put product A back, find another product and start again.

Solution: How handy would it be to have a pocket scanner, that not only scans products' barcodes to check for allergens, but matches the product with a person's profile? The profile does not have to be limited to allergies and intolerances, but could include likes/dislikes, medical issues, religion-related restrictions, life choices and more! And if you're cooking for multiple people, you could easily check if the product is safe for everyone who is sharing the meal.