Most restaurant owners think about dietary needs as a small minority of customers. Someone at the table who needs a menu adjustment, a question from the kitchen about whether something has gluten. Important to handle well, but not a defining business consideration.
The numbers tell a different story.
What the Food Standards Agency found
The FSA's 2024 research on food hypersensitivity is the most comprehensive recent picture of how widespread these conditions are in the UK. The headline figure: over 30% of UK adults report living with a food hypersensitivity.
Food hypersensitivity covers three distinct things: food allergy, food intolerance, and coeliac disease. They're different in important ways – different mechanisms, different levels of risk, different implications for what a customer needs from a restaurant – but they share one common characteristic: the person has to think carefully about what they eat.
Around 2.4 million UK adults have a clinically confirmed food allergy. This group faces the risk of serious, potentially life-threatening reactions from exposure to specific allergens. They research carefully, call ahead, and make decisions based on the quality of the information available to them before they ever set foot on your premises.
A much larger group manages food intolerances. Reactions aren't life-threatening, but they significantly affect how someone feels after eating, and they shape dining choices accordingly. Simply put, a customer with a lactose intolerance who has a bad experience won't be back.
Around 1% of the UK population has coeliac disease, an autoimmune condition triggered by gluten. For this group, even trace cross-contamination has consequences. They need a higher level of confidence than other customers, and they typically check more carefully before choosing where to eat.
What this means in your restaurant
Take a restaurant with 60 covers. On a busy Friday evening, those seats are filled with customers who reflect the general population. Based on FSA data, around 18 to 20 of those customers, roughly a third, have some form of dietary consideration.
Not all of them will ask a question. Some will have already checked your menu online and decided it works. Some will scan the menu and make safe choices without engaging with staff. Some will ask the server. Some will order the thing they know is safe without asking.
But all of them thought about it. And most of them thought about it before they arrived, at the point they decided to book, or decided not to.
The silent decision
This is what most restaurants miss. The decision about whether to visit doesn't happen at the table. It happens on a phone, at home, during a quick search at 7pm when someone is trying to decide where to take a group.
A customer with an allergy or coeliac disease looking at your menu online is doing something specific: checking whether there's enough information to trust that they can eat safely. If the information isn't there, they’ll quickly move on. You don't get a chance to have the conversation. You won’t even know they were looking. And they're rarely just deciding for themselves: one person's food restriction typically decides where the whole table eats.
This dynamic is where the commercial opportunity lives. Not in going out and acquiring a new audience, but in being accessible to the audience who is already looking.
The 2.4 million with confirmed allergies
The allergy figure deserves to be highlighted because this group is the most safety-critical and the most likely to research thoroughly before booking.
2.4 million people with clinically confirmed food allergies. These are people who have, in many cases, had a serious reaction at some point. They are careful. They check. They read reviews specifically for mentions of how well a restaurant handled dietary needs.
When they find a restaurant that has clear allergen information available (ideally online, without needing to ask) they have an experience that the majority of restaurants can't offer them. That's the basis for the loyalty described in other articles in this series. It starts here, with being findable and accessible to this audience before they ever set foot through the door.
The practical question
If you run a 40-cover café and have assumed allergen questions are a minor edge case, the data suggests you're receiving these customers regularly. You just can't always see the ones who decided not to come, or who came but chose the safest option on the menu without engaging with your team.
The practical question for any food business is: for the 30%+ of potential customers who have some form of dietary need, how easy have you made it to choose you?
Not how compliant are you. Not how much effort your staff put into answering questions. How easy is it for that customer to find the information they need before they decide?
That's the commercial question. Everything else follows from it.