If a student has an allergy recorded in their Diet notes details you can assign a diet/allergy safe menu to prevent the user from selecting a meal which may contain products associated with the allergy.
This article will teach you...
How to assign a diet/allergy safe Student Menu Template to a specific student.
If the user had selected the Other Allergy option from the Allergies tab the Menu template drop-down list  will become available in to select in the Student tab .
Select the Menu that has been created for this student from the list and click Save .