> Hi Alex,
>
> Where did you get your figure of 5 million worldwide? Is this for milk
> allergy or all food allergies?
Neither.
Kashrut is a religious thing - the dietary "laws" of Judaism (of which the dairy-related rules are just a small part).
Given the 12-13 million Jews worldwide estimation that I found on the web and guessing that less than half observe kashrut gave me the 5 million estimate.